About Pull Request

Init start screen. Add buttons to the start screen.

Successful PR check-list

[x] I explained what's changed.
[x] The PR is ready to merge and completely finished (or I've written out what I'm going to do next in this PR and moved it to draft).
[ ] I've requested a review from the project owner or some of the contributors.
[x] I've read contributing guide.
[x] I understand that the PR will not get a review until all checks have been passed.
[x] I understand that I can't merge PR without a review.