version-control/git/cheet-sheet.md: Add a Git-specific cheat sheet

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+Basic use
+=========
+
+* Create a local repository from a public repository at `$URL`:
+
+        $ git clone $URL
+
+* Stage a (possibly new) file (or files) for the next commit:
+
+        $ git add $FILES
+
+* Remove a file (or files) with the next commit:
+
+        $ git rm $FILES
+
+* Commit any local changes to the local repository:
+
+        $ git commit -a -m "$MESSAGE"
+
+* Push any local commits to a public repository (e.g. `origin`):
+
+        $ git push origin
+
+Merging
+=======
+
+* Update your local view of a public repository (e.g. `origin`):
+
+        $ git fetch origin
+
+* Merge new commits from another branch (e.g. the `origin/master`
+  branch tracking the `master` branch of the `origin` repository):
+
+        $ git merge origin/master
+
+* Mark conflicts as resolved:
+
+        $ git add $FILES
+
+Comparing changes
+=================
+
+* Compare the current working directory to the last commit:
+
+        $ git diff HEAD
+
+Browsing history
+================
+
+* Check your local state:
+
+        $ git status
+
+* View past commits:
+
+        $ git log
+
+* Who wrote this line, and what were they thinking?
+
+        $ git blame $FILES
+        $ git show $COMMIT_HASH
+
+Recovering old versions
+=======================
+
+* Undo local changes to `$FILES` since the last commit:
+
+        $ git checkout $FILES
+
+* Checkout `$FILES` as they were during `$COMMIT`:
+
+        $ git checkout $COMMIT -- $FILES
+
+* Create a new commit backing out changes made by an old commit:
+
+        $ git revert $COMMIT
+
+Setting up a repository
+=======================
+
+* Create a new repository in the current directory:
+
+        $ git init
+
+Provenance
+==========
+
+* Tag releases:
+
+        $ git tag v1.2.3
+        $ git push --tags origin
+
+* Incorperate the tags into any releases.  For example, the Git
+  project extracts [version information][git-version-gen] when you
+  [compile the project][git-makefile].  Most Python projects just
+  increment `package.__version__` by hand
+  (e.g. [pygit2][pygit2-version]).
+
+
+[git-version-gen]: http://git.kernel.org/cgit/git/git.git/tree/GIT-VERSION-GEN
+[git-makefile]: http://git.kernel.org/cgit/git/git.git/tree/Makefile
+[pygit2-version]: https://github.com/libgit2/pygit2/blob/master/pygit2/version.py