create guest route for /donations/reports

[mirmahathir1]

The guest api is a set of routes that we use to demonstrate our app without actually logging in. Calling these routes won't do any database operation and these routes generate dummy data structurally similar to the actual endpoints. Your task is to write the guest route for the GET /donations/reports in the following file

https://github.com/Badhan-BUET-Zone/badhan-backend/blob/master/src/routes/guest.ts

As this route is currently not implemented, visiting the report page in guest mode will give you an error.

Also, as a side note, if you feel like the guest login feature is not a feature worth maintaining, let me know.

As a side task of this issue, update the readme to include your own name as the developer.