Add a screenshot of the feedback page in the 'Screenshots' part of the README.md file

To Reproduce

Steps to reproduce the behaviour:

1. Go to mentorship-android GitHub repository
2. Go to README.md
3. Go to Screenshots
4. Click on this link to download the app to your android system
5. Username: string2, Password: 12345678
6. Log in
7. Go to Settings (top right corner)
8. Go to Feedback
9. Take the screenshot
10. Edit the screenshot and add the title 'Feedback Page' (like the other screenshots in the README.md)
11. Upload the screenshot in the README.md

Expected behaviour

Upload the screenshot here

Additional context

Adjust the size of the screenshot to match the other screenshots in the README.md file