Added Tutorials for Coin Flip, Donation and Advanced XCC

.gitignore

@@ -9,6 +9,7 @@ website/i18n/*
 website/.docusaurus/*
 website/package-lock.json
 website/yarn.lock
+website/pnpm-lock.yaml
 neardev
 .idea
 .docz

docs/tutorials/advanced-xcc/0-introduction.md

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+---
+id: introduction
+title: Advanced Cross-Contract Calls on NEAR
+sidebar_label: Introduction
+description: "Master complex cross-contract call patterns in NEAR Protocol, including batch operations, parallel execution, and advanced error handling."
+---
+
+Cross-contract calls are one of NEAR's most powerful features, enabling smart contracts to interact with each other seamlessly. While basic cross-contract calls allow simple interactions, advanced patterns unlock the full potential of NEAR's composable architecture.
+
+## What You'll Build
+
+By the end of this tutorial, you'll master how to:
+
+- **Batch multiple actions** to the same contract with atomic rollback
+- **Execute parallel calls** to different contracts simultaneously
+- **Handle complex responses** from multiple contract interactions
+- **Manage gas efficiently** across multiple contract calls
+- **Implement robust error handling** for multi-contract scenarios
+
+## Why Advanced Cross-Contract Calls Matter
+
+These patterns are essential for:
+
+- **DeFi protocols** that interact with multiple token contracts and AMMs
+- **Gaming platforms** that manage assets across different contract systems
+- **DAO governance** systems that execute proposals across multiple contracts
+- **NFT marketplaces** that coordinate with various collection contracts
+
+:::info Source Code
+
+The complete source code is available at [near-examples/cross-contract-calls](https://github.com/near-examples/cross-contract-calls).
+
+Test contracts are deployed on testnet:
+- `hello.near-examples.testnet`
+- `counter.near-examples.testnet`
+- `guestbook.near-examples.testnet`
+
+:::
+
+## How It Works
+
+Advanced cross-contract calls leverage NEAR's promise-based architecture:
+
+```mermaid
+graph TD
+    A[Your Contract] --> B[Batch Actions]
+    A --> C[Parallel Calls]
+
+    B --> D[Same Contract - Action 1]
+    B --> E[Same Contract - Action 2]  
+    B --> F[Same Contract - Action 3]
+
+    C --> G[Contract A]
+    C --> H[Contract B]
+    C --> I[Contract C]
+
+    D --> J[Single Result]
+    E --> J
+    F --> J
+
+    G --> K[Array of Results]
+    H --> K
+    I --> K
+```
+
+Key concepts:
+
+- **Atomicity**: Batch actions either all succeed or all fail
+- **Parallelism**: Multiple contracts execute simultaneously
+- **Complex responses**: Handle arrays of results with individual success/failure states
+- **Gas optimization**: Efficient gas distribution across multiple calls
+
+## What You Will Learn
+
+This tutorial is organized into focused chapters:
+
+1. **[Project Setup](1-setup.md)** - Get the example project running locally
+2. **[Batch Actions](2-batch-actions.md)** - Learn atomic multi-action patterns
+3. **[Parallel Execution](3-parallel-execution.md)** - Execute multiple contracts simultaneously  
+5. **[Testing & Deployment](4-testing-deployment.md)** - Test and deploy your contracts
+
+Let's [get started with the project setup](1-setup.md)!

docs/tutorials/advanced-xcc/1-setup.md

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+---
+id: setup
+title: Setting up the Advanced Cross-Contract Calls Project
+sidebar_label: Project Setup
+description: "Get the advanced cross-contract calls example project running locally with all necessary dependencies and test contracts."
+---
+
+import Tabs from "@theme/Tabs";
+import TabItem from "@theme/TabItem";
+
+Let's set up the project environment with the main contract and test contracts.
+
+## Obtaining the Project
+
+```bash
+git clone https://github.com/near-examples/cross-contract-calls
+cd cross-contract-calls
+```
+
+Choose your language:
+
+<Tabs>
+  <TabItem value="js" label="JavaScript" default>
+
+```bash
+cd contract-advanced-ts
+npm install
+```
+
+  </TabItem>
+  <TabItem value="rust" label="Rust">
+
+```bash
+cd contract-advanced-rs
+cargo check
+```
+
+  </TabItem>
+</Tabs>
+
+## Project Structure
+
+```
+├── tests/                    # Test environment
+│   └── external-contracts/   # Pre-compiled contracts
+│       ├── counter.wasm      # Simple counter
+│       ├── guest-book.wasm   # Message storage
+│       └── hello-near.wasm   # Greeting contract
+├── src/                      # Main contract code
+│   ├── batch_actions.*       # Batch operations
+│   ├── multiple_contracts.*  # Parallel execution
+│   └── similar_contracts.*   # Same-type calls
+└── README.md
+```
+
+## Test Contracts Overview
+
+### Hello NEAR Contract
+- `get_greeting()` - Returns current greeting
+- `set_greeting(message: string)` - Updates greeting
+
+### Counter Contract  
+- `get_num()` - Returns current count
+- `increment()` - Increases by 1
+- `decrement()` - Decreases by 1
+
+### Guest Book Contract
+- `add_message(text: string)` - Adds message
+- `get_messages()` - Returns all messages
+
+## Building the Contract
+
+<Tabs>
+  <TabItem value="js" label="JavaScript" default>
+
+```bash
+npm run build
+# Output: build/cross_contract.wasm
+```
+
+  </TabItem>
+  <TabItem value="rust" label="Rust">
+
+```bash
+cargo near build
+# Output: target/wasm32-unknown-unknown/release/cross_contract.wasm
+```
+
+  </TabItem>
+</Tabs>
+
+## Running Tests
+
+Verify everything works:
+
+<Tabs>
+  <TabItem value="js" label="JavaScript" default>
+
+```bash
+npm test
+```
+
+  </TabItem>
+  <TabItem value="rust" label="Rust">
+
+```bash
+cargo test
+```
+
+  </TabItem>
+</Tabs>
+
+Expected output:
+```
+✓ Test batch actions
+✓ Test multiple contracts  
+✓ Test similar contracts
+```
+
+## Contract Initialization
+
+The main contract needs external contract addresses:
+
+<Tabs>
+  <TabItem value="js" label="JavaScript" default>
+
+```typescript
+@NearBindgen({})
+export class CrossContractCall {
+  hello_account: AccountId;
+  counter_account: AccountId;
+  guestbook_account: AccountId;
+
+  @initialize({})
+  init({
+    hello_account,
+    counter_account,
+    guestbook_account,
+  }: {
+    hello_account: AccountId;
+    counter_account: AccountId;
+    guestbook_account: AccountId;
+  }) {
+    this.hello_account = hello_account;
+    this.counter_account = counter_account;
+    this.guestbook_account = guestbook_account;
+  }
+}
+```
+
+  </TabItem>
+  <TabItem value="rust" label="Rust">
+
+```rust
+#[near_bindgen]
+impl Contract {
+    #[init]
+    pub fn init(
+        hello_account: AccountId,
+        counter_account: AccountId,
+        guestbook_account: AccountId,
+    ) -> Self {
+        Self {
+            hello_account,
+            counter_account,
+            guestbook_account,
+        }
+    }
+}
+```
+
+  </TabItem>
+</Tabs>
+
+## Deploy Your Contract
+
+```bash
+# Create your account
+near account create-account sponsor-by-faucet-service xcc.YOUR_NAME.testnet autogenerate-new-keypair save-to-keychain network-config testnet create
+
+# Deploy with initialization
+near contract deploy xcc.YOUR_NAME.testnet use-file ./build/cross_contract.wasm with-init-call init json-args '{
+  "hello_account":"hello.near-examples.testnet",
+  "counter_account":"counter.near-examples.testnet",
+  "guestbook_account":"guestbook.near-examples.testnet"
+}' prepaid-gas '100.0 Tgas' attached-deposit '0 NEAR' network-config testnet sign-with-keychain send
+```
+
+Now let's explore [batch actions](2-batch-actions.md) in the next chapter!