Added Monokai Bright Extended theme

Hi!

Since I use Monokai Bright as my theme of choosing, I decided to blatantly copy your changes from Monokai extended over to Monokai Bright and call it Monokai Bright Extended.

I prefer Monokai Bright over the standard Monokai as it highlights the selection areas more brightly.

Here's the file, could you consider adding it in? :)