docs: add RainyModel configuration guide for Orcest AI

- OpenAI-Compatible provider setup with rm.orcest.ai
- Feature-to-model mapping (Chat, Ctrl+K, Autocomplete, Apply)
- Available model aliases and routing info

Co-Authored-By: Danial Piterson <danial.samiei@gmail.com>

README.md

@@ -37,5 +37,37 @@ For a guide on how to develop your own version of Void, see [HOW_TO_CONTRIBUTE](
 
 
 
+## Orcest AI / RainyModel Configuration
+
+Orcide connects to the [RainyModel](https://rm.orcest.ai) LLM proxy for unified model routing across free, internal, and premium backends.
+
+### Setup
+
+1. Open Orcide Settings (gear icon in sidebar)
+2. Select **OpenAI-Compatible** as the provider
+3. Configure:
+   - **baseURL**: `https://rm.orcest.ai/v1`
+   - **API Key**: Your RainyModel API key
+4. Add models and assign to features:
+
+| Feature | Recommended Model |
+|---------|------------------|
+| Chat | `rainymodel/chat` |
+| Quick Edit (Ctrl+K) | `rainymodel/code` |
+| Autocomplete | `rainymodel/code` |
+| Apply | `rainymodel/auto` |
+
+### Available Models
+
+- `rainymodel/auto` - General purpose, cost-optimized routing
+- `rainymodel/chat` - Conversation and Persian language
+- `rainymodel/code` - Code generation and completion
+- `rainymodel/agent` - Complex agent tasks (long context)
+
+### Routing
+
+RainyModel routes requests: FREE (HF/ollamafreeapi) -> INTERNAL (Ollama) -> PREMIUM (OpenRouter).
+Use the `X-RainyModel-Policy` header for custom routing (auto, uncensored, premium, free).
+
 ## Support
 You can always reach us in our Discord server or contact us via email: hello@voideditor.com.