Added Syntax Highlight

[KaanErkol]

No description provided.

[karthikv]

Thanks for the pull request! I'm not sure, however, if CodeMirror is necessary for this project. It seems to add quite a bit of overhead in terms of code, and the results are some basic syntax highlighting, which I don't think adds much to CSS editing. Recall that this code will be inserted into every page the user visits in Chrome, so I'd like to keep the project as succinct as possible. Taking this into account, do you still think CodeMirror is necessary? If so, let me know your reasoning.

If we decide to go through with syntax highlighting, I'll comment on the code in the pull request and let you know what changes are necessary. For starters, you seem to have three duplicate commit messages. Some commits deal with merge conflicts and others appear to modify more files than they actually need to touch. This history will be need to be cleaned up into one commit if we decide to go through with syntax highlighting.