Update README.md

[crsaracco]

• Remove "Community" section in favor of shields.io buttons (and made them stick out more)
• Remove "TODO" section in favor of using GitHub issue tracker

[crsaracco]

Here are the issues I made tracking the bullet points I'm removing:

• Implement all opcodes #95 - Implement all opcodes
• Write more tests #96 - Write more tests
• Provide better examples #97 - Provide better examples

The following two issues touch on the editor (GUI) issue:

• GUI example #82 - GUI example
• Written comparison of possible GUI approaches, with pros and cons #84 - Written comparison of possible GUI approaches, with pros and cons

I'd be fine with closing those two issues and making a larger issue tracking the progress of GUIs, since it is quite the undertaking. I started down the path of creating a GUI library with OpenGL support here (with some more prototypes here, and there's also rtb-rs which is seemingly in a state of limbo right now), but so far I've only gotten a Linux window to the point where I want it, and it doesn't even actually draw anything to the OpenGL context yet.

[Walther]

Nice!