Update README and metadata (#50)

## Problem

Left placeholders in the README and lacking metadata in Cargo.toml

## Solution

This change updates sections of the README and adds metadata to
Cargo.toml

## Type of Change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] This change requires a documentation update
- [ ] Infrastructure change (CI configs, etc)
- [x] Non-code change (docs, etc)
- [ ] None of the above: (explain here)

## Test Plan

No code was changed. All test cases pass

Author: emily-emily

Cargo.toml

@@ -4,9 +4,12 @@ version = "0.1.0"
 edition = "2021"
 description = "Pinecone Rust SDK"
 repository = "https://github.com/pinecone-io/pinecone-rust-client"
+homepage = "https://www.pinecone.io/"
 rust-version = "1.78.0"
 readme = "./README.md"
 license = "Apache-2.0"
+keywords = ["pinecone", "vector", "database", "cloud", "vectordb"]
+categories = ["api-bindings", "database"]
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 

README.md

@@ -1,16 +1,14 @@
 # Pinecone Rust SDK
 
+This SDK is still in an alpha state. While it is mostly built out and functional, it may undergo changes as we continue to improve the UX. Please try it out and give us your feedback, but be aware that updates may introduce breaking changes.
+
 ## Documentation
 
 [reference the documentation here]
 
-### Example code
-
-[reference the sample app]
-
 ## Prerequisites
 
-Rust version?
+Rust version: tested with Rust version 1.78.0
 
 Before you can use the Pinecone SDK, you must sign up for an account and find your API key in the Pinecone console dashboard at [https://app.pinecone.io](https://app.pinecone.io).