Fixes typos in CompletionEngine

Issue: #27
Adds readme

Issue: #23
Merge branches 'fix/27/pre_release_fixes' and 'feature/23/readme' into develop

* fix/27/pre_release_fixes:
  Fixes typos in CompletionEngine

* feature/23/readme:
  Adds readme

Issue: #23
Issue: #27
Bumps version to 0.2