AI proxy spin app

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+# AI Proxy
+
+This folder contains a [Spin](https://www.fermyon.com/spin) application, based on the WASI 2 and the WebAssembly Component Model ( https://component-model.bytecodealliance.org/ ). It is implemented in Rust as a serverless proxy for the OpenAI API.
+
+There is a simple example of a web client in the [web](./web/) folder.
+
+The application will keep track of of token usage per conversation in the built-in key-value storage of Spin. The initial balance for a conversation is retrieved from the Fungible Token smart contract.
+
+To launch the application, make sure to have the Spin SDK installed. Set the environment variable `SPIN_VARIABLE_OPENAI_API_KEY` to your OpenAI API key.
+
+Then run the following commands:
+
+```
+spin build
+spin up
+```
+
+This will start the OpenAI proxy server at http://localhost:3000
+
+You can also launch the web client using for example [http-server](https://www.npmjs.com/package/http-server):
+
+```
+http-server web
+```
+
+You will then find the web client at http://localhost:8080. Here you can have a conversation with the AI model.