fixed folder name

[yashasvimisra2798]

Description

• All the links to the federated learning team in the README.md weren't working.
• The solution to issue #43

Affected Dependencies

• NA

How has this been tested?

• The folder name was changed from federated_learning to federated_learning_team

Checklist

• [x] I have followed the Contribution Guidelines and Code of Conduct
• [x] I have labeled this PR with the relevant Type labels