Rename README to README.md

Signed-off-by: Geoff Levand <geoff@infradead.org>

README

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README.md

diff --git a/README.md b/README.md
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+# libtwin
+
+A tiny window system library
+
+## Licence & Usage
+
+All files in the Twin library are free software distributed under the
+[GNU Lesser General Public License](COPYING).