Add CONTRIBUTING

CONTRIBUTING.md

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+These guidelines have been adapted from [awesome CONTRIBUTING](https://github.com/sindresorhus/awesome/blob/master/contributing.md) and the [awesome manifesto](https://github.com/sindresorhus/awesome/blob/master/awesome.md).
+
+# Contribution Guidelines
+
+### Table of Contents
+- [Adding to this list](#adding-to-this-list)
+- [Only awesome is awesome](#only-awesome-is-awesome)
+- [Comment on why something is awesome](#comment-on-why-something-is-awesome)
+- [Guidelines](#guidelines)
+
+## Adding to this list
+
+If you want something to be included on `awesome-LaTeX`, try to only add actual awesome stuff in your pull requests. After all, it's a curation, not a collection.
+
+But **what is awesome?**
+
+## Only awesome is awesome
+
+Research if the stuff you're including is actually awesome. Put only stuff on the list you can personally recommend and rather leave stuff out than include too much.
+
+## Comment on why something is awesome
+
+Apart from suggesting a particular item, you should also inform your readers *why* it's on the list and how they will benefit from it.
+
+## Guidelines
+
+Please ensure your pull request adheres to the following guidelines:
+
+- Search previous suggestions before making a new one, as yours may be a duplicate.
+- Please only add/remove one (1) item per commit.
+- Please ensure your items are formatted consistently with the rest, e.g. as  `[List Name](link) - description.`
+- Link additions should be added to the bottom of the relevant category.
+- New categories or improvements to the existing categorization are welcome.
+- Please update the table of contents as needed.
+- Check your spelling and grammar.
+- Make sure your text editor is set to remove trailing whitespace.
+- Self-promotion can be okay, but _only_ if you clearly state your involvement.
+- The pull request and commit should have a useful title.
+
+**Thank you for your suggestions!**
+