Add initial project

.env.example

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+# HabitForge Environment Configuration
+# Copy this file to .env.development, .env.staging, or .env.production
+# and fill in the actual values.
+
+# Security
+SECRET_KEY=your-secret-key-here-generate-with-python-secrets-token_urlsafe32
+ALGORITHM=HS256
+ACCESS_TOKEN_EXPIRE_MINUTES=30
+
+# Database
+# For development (SQLite):
+DATABASE_URL=sqlite:///./data/habitforge.db
+# For production (PostgreSQL):
+# DATABASE_URL=postgresql://user:password@localhost:5432/habitforge
+
+# CORS (Comma-separated list of allowed origins)
+CORS_ORIGINS=http://localhost:8000,http://localhost:3000,https://yourdomain.com
+
+# Google OAuth
+GOOGLE_CLIENT_ID=your-google-client-id
+GOOGLE_CLIENT_SECRET=your-google-client-secret
+GOOGLE_REDIRECT_URI=http://localhost:8000/api/google/callback
+
+# Rate Limiting
+RATE_LIMIT_ENABLED=true
+RATE_LIMIT_TIMES=60
+RATE_LIMIT_SECONDS=60
+
+# Application
+APP_NAME=HabitForge API
+APP_VERSION=1.0.0
+DEBUG=true