create awesome list for flutter hackathon 2020

[gspanoae]

Include and link into main README catalogue an awesome list of projects and stuff related to flutter hackathon 2020

[gspanoae]

For how to use see:

• https://github.com/sindresorhus/awesome &&
• https://github.com/sindresorhus/awesome/blob/main/create-list.md
  List template generated using yo awesome-list

[gspanoae]

@attibalazs once done adding all your notes please close this issue