Chore/add setup and contributing docs (#90)

* chore: add dev setup documentation

* Add agents.md files

* simplify contributing documentation

AGENTS.md

@@ -0,0 +1,41 @@
+# Dograh - Project Overview
+
+Dograh is a voice AI platform for building and deploying conversational AI agents with telephony and WebRTC support.
+
+## Project Structure
+
+```
+dograh/
+├── api/              # Backend - FastAPI application
+├── ui/               # Frontend - Next.js application
+├── scripts/          # Helper scripts for local development
+├── docs/             # Mintlify documentation
+├── pipecat/          # Pipecat framework (git submodule)
+├── docker-compose.yaml       # Production/OSS deployment
+├── docker-compose-local.yaml # Local development services
+```
+
+## Tech Stack
+
+- **Backend**: Python with FastAPI
+- **Frontend**: Next.js 15 with React 19, TypeScript, Tailwind CSS
+- **Database**: PostgreSQL with SQLAlchemy (async)
+- **Cache/Queue**: Redis with ARQ for background tasks
+- **Storage**: MinIO (S3-compatible) for audio files
+
+## Local Development
+
+### Starting Services
+
+```bash
+# Start infrastructure services (postgres, redis, minio)
+./scripts/start_services.sh --dev
+
+# Stop all services
+./scripts/stop_services.sh
+```
+
+## Environment Configuration
+
+- `api/.env` - Backend environment variables
+- `ui/.env` - Frontend environment variables