Initial project setup with MIT license

- Add MIT License (Copyright 2025 David Folch Agulles)
- Add README with project description
- Add .gitignore for Go project
- Add .env.example for configuration
- Initialize Go module

.env.example

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+DB_TYPE=sqlite
+DB_PATH=./data/habits.db
+
+PORT=8080
+HOST=0.0.0.0
+
+JWT_SECRET=change-me-in-production
+JWT_EXPIRY=24h
+REFRESH_TOKEN_EXPIRY=168h
+
+CORS_ORIGINS=http://localhost:3000
+
+DEFAULT_TIMEZONE=UTC

.gitignore

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+.env
+data/
+*.db
+*.db-shm
+*.db-wal
+habit-tracker-api
+dist/
+bin/
+.internal-notes/

LICENSE

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+MIT License
+
+Copyright (c) 2025 David Folch Agulles
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Habit Tracker API
+
+Self-hosted habit tracking service with a clean, hexagonal architecture.
+
+## Features
+
+- **Multiple habit types**: Boolean (check), Counter, Value
+- **Flexible scheduling**: Daily, Weekly, Monthly with specific days
+- **Carry-over support**: Choose if incomplete habits persist or expire
+- **Full history tracking**: Complete audit trail of all interactions
+- **Charts & Analytics**: Heatmaps, line charts, and statistics
+- **Self-hosted first**: Easy deployment with SQLite or PostgreSQL
+
+## Quick Start
+
+### Using the binary
+
+1. Download the latest release
+2. Copy `.env.example` to `.env` and configure
+3. Run: `./habit-tracker-api`
+
+The API will be available at `http://localhost:8080`
+
+## Development
+
+### Prerequisites
+
+- Go 1.23+
+- SQLite (or PostgreSQL)
+
+### Running locally
+
+```bash
+cp .env.example .env
+go run cmd/api/main.go
+```
+
+## API Documentation
+
+Once running, visit `http://localhost:8080/api/v1/docs` for interactive API documentation.
+
+## Architecture
+
+This project follows hexagonal (ports & adapters) architecture:
+
+- `domain/`: Core business logic and entities
+- `application/`: Use cases (commands & queries)
+- `infrastructure/`: External adapters (database, HTTP, etc.)
+- `shared/`: Common utilities and errors
+
+## License
+
+MIT

go.mod

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+module habit-tracker-api
+
+go 1.23.4