Ceos is a test coverage serverless template with CI/CD and MongoDB connection to make easier and faster to develop a serveless app

• add License
• improve test coverage
• put a practical example
• autogenerate policies
• add CI/CD
• add filter on db query
• add pagination on db query
• improve promises
• improve packages usage (really needs path?)
• add constants usage example
• add helper functions usage example
• add subschema usage for object type (Remove _id from nested object)
• add object id model reference usage example