Merge pull request #804 from schu/examples-readme

examples: add README

examples/README.md

+libgit2 examples
+================
+
+These examples might don't work on all platforms and are meant as thin,
+easy-to-read snippets for docurium (https://github.com/github/docurium)
+rather than full-blown implementations of Git commands.
+
+For a HTML version check "Examples" at http://libgit2.github.com/libgit2