create tests for main.py

**Create test for the backend** -

``` bash

1. GET/match
2. GET/getMatchesByTeam
3. GET/getMatchByWinner
4. GET/getMatchesByCity

```

**API url** - https://iplapi.projects.arunavabasu.com
**References** - https://fastapi.tiangolo.com/tutorial/testing/
 
