Create repository for mobile development

[oguzsenna]

• [x] Create a new repository for mobile
• [x] Add Flutter specific .gitignore file
• [x] Construct pre-commit mechanism
• [x] Add the professor as a collaborator

[sadikkuzu]

Repo is ready: https://github.com/SWE574-Fall2023-Group1/SWE574-Fall2023-G1-mobile

And this issue is ready for review. @oguzsenna

[sadikkuzu]

@SWE574-Fall2023-Group1/mobile