text: Title: Add docstrings for public packages etc
  Body: 
  ## Public Packages
  ```
  hexapod/
  widgets/
  pages/
  tests/
  
  ```
  ## Some public methods
  ```
  hexapod/ik_solver/ik_solver2.py
  - init 
  
  hexapod/linkage.py
  - init
  - str
  - repr
  
  hexapod/points.py
  - init
  - repr
  - str
  - eq
  
  hexapod/models.py
  - for VirtualHexapod
  - for Hexagon
  ```
  
  See also: https://www.python.org/dev/peps/pep-0257/