Add Cosmos triggers example

subgraph-triggers/cosmos-usdt-exchange-volume/.gitignore

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+# Graph CLI generated artifacts
+build/
+generated/
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Logs
+logs
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# dotenv environment variables file
+.env
+
+# Testing
+coverage
+coverage.json
+
+# Typechain
+typechain
+typechain-types
+
+# Hardhat files
+cache

subgraph-triggers/cosmos-usdt-exchange-volume/README.md

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+# Subtreams Triggers - Importing transactions from the USDT Exchange Substreams.
+
+## Getting Started
+
+1. Prepare the substreams
+
+The [injective-common](https://substreams.dev/streamingfast/injective-common/v0.1.0) substreams has a `filtered_events` module that allows getting only the events that match certain types.
+
+We will prepare a substreams package file (.spkg) with that parameter baked-in. Here, we want the event type `wasm`:
+
+```yaml
+# substreams.yaml
+specVersion: v0.1.0
+package:
+  name: wasm_events
+  version: v0.1.0
+
+network: injective-mainnet
+imports:
+  injective: https://spkg.io/streamingfast/injective-common-v0.1.0.spkg
+
+modules:
+  - name: wasm_events
+    use: injective:filtered_events
+
+params:
+  wasm_events: "wasm"
+```
+
+Using substreams v1.7.2 or above (https://github.com/streamingfast/substreams/releases), build the package:
+
+```bash
+substreams pack
+```
+
+This creates the `wasm-events-v0.1.0.spkg` file in the local folder, which will be referenced by subgraph.yaml.
+
+
+2. Install the dependencies:
+
+```bash
+npm install
+```
+
+3. Generate the code defined in the mappings
+
+```bash
+npm run codegen
+```
+
+4. Generate the Protobuf of the EventList that substreams outputs (and its dependencies):
+
+```bash
+# you probably want to delete the previous bindings
+# rm -rf src/pb
+buf generate --type="sf.substreams.cosmos.v1.EventList"  wasm-events-v0.1.0.spkg#format=bin
+```
+
+5. Code your subgraph in `mappings.ts`, build it, deploy it on a local graph-node instance connected to injective-mainnet:
+
+```bash
+npm run build
+npm run create-local
+npm run deploy-local
+# npm run remove-local
+```
+
+6. Publish to The Graph network:
+
+```bash
+npm run publish
+```
+

subgraph-triggers/cosmos-usdt-exchange-volume/buf.gen.yaml

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+version: v1
+plugins:
+  - name: as-generator
+    path: ./node_modules/.bin/as-proto-gen
+    strategy: all
+    out: src/pb