Requests unit testing

Summary

• Added unit tests for requests
  • These tests assert that a valid request results in expected database operations
• Wrote a better readme file along with its french translation

Complete changelog

Added

• Readme
  • General presentation.
  • French version.
  • Link to license file.
• Validation
  • New borrowing
    • Rules for notes field.
• Testing
  • Unit tests for notes field rules of new borrowing request.
  • New borrowing request.
  • End borrowing request.
  • Add inventory item request.
  • Patch inventory item request.
  • Delete inventory item request.
  • Patch user request.
  • Delete user request.

Changed

• Edit user request
  • Renamed to Patch user request in controller, tests and language files.

Removed

• Testing
  • Useless (and incorrect) namespace for unit tests.