Create an appropriate readme file

We should create a readme.md file in the root of this repository. This file should include:

• Link to the Google Drive folder (peers-only)
• Link to the actual version of the Game Design Document (located in the root folder, can be peer-only)
• Link to the Figma UI mock-up (can be peers-only)
• Link to the actual entity-relationship UML diagram (can be peer-only)
• Link to the current Unity version the project uses
• Link to download JetBrains Rider
• Description of the Git workflow as it was described for Assignment 3
• Above should include the link to Conventional commits
• Conventional commits section should describe used commit labels, mention that domain is optional:
  • feature(domain) - you've something new, added a feature
  • fix(domain) - you fixed an issue or a mistake
  • chore(domain) - dependency updates, refactoring and cleanup (direct translation of the word "chore" is "рутина")