add an .env file in the frontend

[chandel-aman]

• add an .env file with two environment variables for the backend url with

1. for locally hosting http://localhost:5000/
2. for web hosting https://amused-cyan-shrimp.cyclic.app/

• replace every instances of the above url with the respective environment variable

[rt-001]

can I work on this?

[taniaban2712]

i want to work on this issue as well.