Update README and manifest for OpenID Connect API Proxy: add description, features, and update icon

Author: fujita-h

README.md

@@ -1,3 +1,5 @@
+![Icon](./_assets/icon-oidc-api-proxy.jpg)
+
 # OpenID Connect API Proxy 
 
 [![GitHub Repo](https://img.shields.io/badge/GitHub_Repo-fujita--h/dify--plugin--oidc--api--proxy-blue?logo=github)](https://github.com/fujita-h/dify-plugin-oidc-api-proxy)  
@@ -6,6 +8,28 @@
 
 This plugin relays the API provided by Dify chat/workflow with OpenID Connect authentication enabled.
 
+## Description
+
+This plugin provides the same API endpoints as the Dify Chat/Workflow API, but uses OpenID Connect authentication instead of Dify's API key authentication.
+
+You can use the endpoints created by this plugin to provide per-user authentication to the API.
+
+## Features
+
+### OpenID Connect authentication
+
+This plugin uses OpenID Connect authentication to authenticate users. You can access the API with the access token obtained by authenticating with OpenID Connect.
+
+### User parameter replacement
+
+You can also replace the `user` parameter specified in the original API with OpenID Connect authenticated claim data. For example, if you replace it with an email address, the user's email address will be displayed on the Dify app log screen.
+
+### Input claim data to the Chat/Workflow App
+
+Plugin automatically inputs the claim data obtained by OpenID Connect authentication into the Chat/Workflow App. You can use the claim data in the Chat/Workflow App.
+
+To use the claim data in the Chat/Workflow App, you need to specify the claim data name to the Start node's `input` parameter. For example, if you specify `__oidc_email` to the `input` parameter, you can use the email address in the Chat/Workflow App.
+
+## Contributing
 
-> [!IMPORTANT]
-> This plugin is still under development and not yet released. Please wait for the release.
+This plugin is open-source and contributions are welcome. Please visit the GitHub repository to contribute.

_assets/icon-oidc-api-proxy.jpg

@@ -3,10 +3,10 @@ type: plugin
 author: fujita-h
 name: oidc_api_proxy
 label:
-  en_US: oidc_api_proxy
+  en_US: OpenID Connect API Proxy
 description:
   en_US: This plugin relays the API provided by Dify chat/workflow with OpenID Connect authentication enabled.
-icon: icon.svg
+icon: icon-oidc-api-proxy.jpg
 resource:
   memory: 268435456
   permission: