chore: create a documentation

Summary

This adds a documentation for Evangeline.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• This PR has been tested
  • The documentation has reflected the changes
  • The code has been linted and formatted
• This PR fixes an issue
• This PR adds a new feature
• This PR adds a breaking change
• This PR is NOT a code change (e.g. documentation, README, ...)