Adding CONTRIBUTING.md

CONTRIBUTING.md

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+# Contribution Guide #
+
+First of all, thank for your contribution! I can't manage this whole thing
+alone, and I welcome pull requests. To make sure that we're all on the same
+page, here are some guidelines to follow for submitting pull requests for this
+list.
+
+## Ensure that everything you link to is free (as in freedom) ##
+
+This is highly important - this list *only* contains freedom-respecting things!
+If you are sending a pull request linking to code, ensure it is licensed under a
+[freedom-respecting license][1]; if you are linking to assets of any kind, make
+sure that [they are the same][2]. For games, be especially careful that they are
+both.
+
+## Indicate the license for anything you add clearly ##
+
+Ensure that you use the correct name for the license (as per [this][1]
+or [this][2]), and indicate any further restrictions clearly. Also check if the
+license is in use already - if it is, don't create another link to it.
+
+## Maintain alphabetical order within sections ##
+
+Pretty self-explanatory, really. Numbers are considered to be higher-ordered
+than anything else, and otherwise, lex order.
+
+## Give a clear commit message ##
+
+The commit message should state clearly *what* you did (adding, removing,
+clarifying, etc.), with *what* (usually by giving the name of the entry), in the
+present continuous tense (i.e. 'adding' not 'added').
+
+[1]: https://www.gnu.org/licenses/license-list.html
+[2]: http://freedomdefined.org/Licenses