Add real-time code editor

[sebbycake]

Summary

1. Create a real-time editor with syntax highlighting for various programming languages
2. Add the ability to select other programming languages in the code room
3. Integrate with matching service (redirect to code room after successful matching)

TODO after milestone

1. Upon successful matching, the question given to the users are hardcoded (easy, medium and hard). Will integrate with question service after milestone 2