Added Tournament Routes

[Uttkarsh24]

This pull request introduces several enhancements to the tournament management system, including new functionalities and code improvements. The most important changes are the addition of a new endpoint for fetching individual results and the reorganization of routes for better access control.

New functionalities:

• Backend/src/controllers/tournament.controller.js: Added a new endpoint getIndividualResult to fetch individual tournament results for a user. This endpoint validates the tournament name and user, retrieves the tournament and user position, and returns the result.

Code improvements:

• Backend/src/controllers/tournament.controller.js: Added a comment indicating that the getResults function is for admin use.
• Backend/src/controllers/tournament.controller.js: Imported mongoose to support database operations.

Route reorganization:

• Backend/src/routes/tournament.routes.js: Updated routes to include the new getIndividualResult endpoint and ensured proper access control by moving getResults to admin-controlled routes.