Endpoints For handling Contest Submissions

[ridhishjain]

Includes:

1. Compilation, running and checking output of user's code file
2. Creation of three users: g++, gcc and linux to accept only C, C++ and python files
   
   

[nveenjain]

You can use https://github.com/remoteinterview/compilebox to submit the code input and get the output, just need to call an api after setting up the server. Simple!