Better README

[gfgit]

Use markdown for README.md.
I like those fancy readmes with icons, sections and links! But I'm currently focusing on code...

[gfgit]

Maybe also create translations like README_it.md and link them in a language selection menu.

[gfgit]

• Mention it is cross-platform even though it has never been tested on Mac OS and poorly tested on Linux
• Use more optimistic language in history
• building a comunity is important
• in contributions Mention that code must be in English (function names, classe, etc) and comments too or at least translated
• Mention UI languages available in README
• Explain how translations work and how to add new language translation to UI