Added new Contributing section and linked to CHANGELOG. Removed Features section. A few other minor edits. I want to do more but I figured we could start with this.
Added new Contributing section and linked to CHANGELOG. Removed
Features section. A few other minor edits. I want to do more but
I figured we could start with this.

rubyide/vscode-ruby,rubyide/vscode-ruby,rubyide/vscode-ruby,rubyide/vscode-ruby,rubyide/vscode-ruby