Add empty gem files

Generated by Bundler.
Add `Typolish::Keylayout`
Add `typolish` executable

Includes 2 commands: `link` and `version`.
Remove the existing .keylayout before symlinking

+ add information where to set Typolish as the main keybord layout.
Add installation instructions
Merge branch 'feature/gem'

* feature/gem:
  Add installation instructions
  Remove the existing .keylayout before symlinking
  Add `typolish` executable
  Add `Typolish::Keylayout`
  Add empty gem files
v1.0.0