v0.1

Features:

• signup users with session stored
• added signin with jwt tokens function

Core:

• README, created and imported index router
• created db connection and config env vars
• morgan middleware, auth and user models
• created signup and signin endpoints
• send jwt token in signin endpoint
• send jwt token in signin controller
• changed db_url in .env.example
• added "SECRET" env var in .env.example
• added custom error handling