docs: add README with usage instructions and example config

Author: Stream29

README.md

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+# ProxyAsLocalModel
+
+Proxy remote LLM API as Local model. Especially works for using custom LLM in JetBrains AI Assistant.
+
+Powered by Ktor and kotlinx.serialization. Thanks to their no-reflex features.
+
+## Currently supported
+
+Proxy from: OpenAI, DashScope(Alibaba Qwen), Gemini, Deepseek, Mistral, SiliconFlow.
+
+Proxy as: LM Studio, Ollama.
+
+Streaming chat completion API only.
+
+## How to use
+
+This application is a proxy server, distributed as a fat runnable jar and a GraalVM native image (Windows x64).
+
+Run the application, and you will see a help message:
+
+```
+2025-05-02 10:43:53 INFO  Help - It looks that you are starting the program for the first time here.
+2025-05-02 10:43:53 INFO  Help - A default config file is created at E:\ACodeSpace\local\OpenAI2LmStudioProxy\OpenAI2LmStudioProxy\build\native\nativeCompile\config.yml with schema annotation.
+2025-05-02 10:43:53 INFO  Config - Config file watcher started at E:\ACodeSpace\local\OpenAI2LmStudioProxy\OpenAI2LmStudioProxy\build\native\nativeCompile\config.yml
+2025-05-02 10:43:53 INFO  LM Studio Server - LM Studio Server started at 1234
+2025-05-02 10:43:53 INFO  Ollama Server - Ollama Server started at 11434
+2025-05-02 10:43:53 INFO  Model List - Model list loaded with: []
+```
+
+Then you can edit the config file to set up your proxy server.
+
+## Config file
+
+This config file is automatically hot-reloaded when you change it. Only the influenced parts of the server will be updated.
+
+When first generating the config file, it will be created with schema annotations. This will bring completion and check in your editor.
+
+## Example config file
+
+```yaml
+# $schema: https://github.com/Stream29/ProxyAsLocalModel/raw/master/config_v0.schema.json
+lmStudio:
+  port: 1234 # This is default value
+  enabled: true # This is default value
+ollama:
+  port: 11434 # This is default value
+  enabled: true # This is default value
+
+apiProviders:
+  OpenAI:
+    type: OpenAi
+    baseUrl: https://api.openai.com/v1
+    apiKey: <your_api_key>
+    modelList:
+      - gpt-4o
+  Qwen:
+    type: DashScope
+    apiKey: <your_api_key>
+    modelList: # This is default value
+      - qwen-max
+      - qwen-plus
+      - qwen-turbo
+      - qwen-long
+  DeepSeek:
+    type: DeepSeek
+    apiKey: <your_api_key>
+    modelList: # This is default value
+      - deepseek-chat
+      - deepseek-reasoner
+  Mistral:
+    type: Mistral
+    apiKey: <your_api_key>
+    modelList: # This is default value
+      - codestral-latest
+      - mistral-large
+  SiliconFlow:
+    type: SiliconFlow
+    apiKey: <your_api_key>
+    modelList:
+      - Qwen/Qwen3-235B-A22B
+      - Pro/deepseek-ai/DeepSeek-V3
+      - THUDM/GLM-4-32B-0414
+  Gemini:
+    type: Gemini
+    apiKey: <your_api_key>
+    modelList:
+      - gemini-2.5-flash-preview-04-17
+```