updated the spotify bearer authorization README and fixed main README… (#402)

* updated the spotify bearer authorization README and fixed main README links

* minor fixes to SPOTIFY README

---------

Co-authored-by: Salman Paracha <salmanparacha@MacBook-Pro-261.local>

README.md

@@ -5,12 +5,12 @@
 
 _Arch is an intelligent (edge and LLM) proxy designed for agentic applications - to help you protect, observe, and build agentic tasks by simply connecting (existing) APIs._
 
-[Quickstart](##quickstart) •
-[Demos](##demos) •
-[Build agentic apps with Arch](###Build-AI-Agent-with-Arch-Gateway) •
-[Use Arch as an LLM router](###Use-Arch-Gateway-as-LLM-Router-) •
+[Quickstart](#Quickstart) •
+[Demos](#Demos) •
+[Build agentic apps with Arch](#Build-AI-Agent-with-Arch-Gateway) •
+[Use Arch as an LLM router](#Use-Arch-Gateway-as-LLM-Router) •
 [Documentation](https://docs.archgw.com) •
-[Contact](##contact)
+[Contact](#Contact)
 
 [![pre-commit](https://github.com/katanemo/arch/actions/workflows/pre-commit.yml/badge.svg)](https://github.com/katanemo/arch/actions/workflows/pre-commit.yml)
 [![rust tests (prompt and llm gateway)](https://github.com/katanemo/arch/actions/workflows/rust_tests.yml/badge.svg)](https://github.com/katanemo/arch/actions/workflows/rust_tests.yml)

demos/use_cases/spotify_bearer_auth/README.md

@@ -1,11 +1,31 @@
-This demo shows how you can use spotify's public APIs using http auth header token.
+# Use Case Demo: Bearer Authorization with Spotify APIs
 
-This demo uses following apis from spotify,
+In this demo, we show how you can use Arch's bearer authorization capability to connect your agentic apps to third-party APIs.
+More specifically, we demonstrate how you can connect to two Spotify APIs:
 
-- /v1/browse/new-releases
-- /v1/artists/{artist_id}/top-tracks
+- [`/v1/browse/new-releases`](https://developer.spotify.com/documentation/web-api/reference/get-new-releases)
+- [`/v1/artists/{artist_id}/top-tracks`](https://developer.spotify.com/documentation/web-api/reference/get-an-artists-top-tracks)
 
-For more details please see arch_config.yaml.
+Where users can engage by asking questions like _"Show me the latest releases in the US"_, followed by queries like _"Show me top tracks from Taylor Swift"_.
 
-To get auth token please follow this
-TODO
+![Example of Bearer Authorization with Spotify APIs](spotify_bearer_auth.png)
+
+## Starting the demo
+
+1. Ensure the [prerequisites](https://github.com/katanemo/arch/?tab=readme-ov-file#prerequisites) are installed correctly.
+2. Create an `.env` file with API keys for OpenAI and Spotify.
+   - Sign up for an OpenAI API key at [https://platform.openai.com/signup/](https://platform.openai.com/signup/)
+   - Sign up for a Spotify Client Key/Secret by following instructions at [https://developer.spotify.com/dashboard/](https://developer.spotify.com/dashboard/)
+   - Generate a Spotify token using the [https://accounts.spotify.com/api/token API](https://accounts.spotify.com/api/token), using ```curl``` or similar commands.
+   - Create a .env file with the following keys:
+   ```
+   OPENAI_API_KEY=your_openai_api_key
+   SPOTIFY_CLIENT_KEY=your_spotify_api_token
+   ```
+
+3. Start Arch
+   ```sh
+   sh run_demo.sh
+   ```
+4. Navigate to http://localhost:18080
+5. Ask "show me new album releases in the US"