Check documentation in Readme.md

The next topics are being built. Feel free to help us organize and keep this up-to-date.

1. Connecting to Database
2. Settings
3. Defining Models
4. Model Properties
5. Model Validations
6. Model Hooks
7. Model Cache
8. Defining Associations
9. hasOne
10. hasMany
11. extendsTo
12. Syncing and Dropping Models
13. Finding Items
14. Creating and Updating Items
15. Aggregation
16. Development
17. Testing
18. Contributing