Chris Bracken ef6d27f840 Formatting cleanup for CONTRIBUTING.md (flutter/engine#26080)
Re-wrap to 80 columns and use references for style guide links.

Unofficially, this is more about triggering a build than cleaning up.
2021-05-11 16:10:16 -07:00
Languages
Dart 75%
C++ 16.5%
Objective-C++ 2.9%
Java 2.8%
Objective-C 0.7%
Other 1.9%