Add the most bare-bones of READMEs

Change-Id: Ib43c774f1d2c697cd94124e3781c1480ce206af9

README

diff --git a/README b/README
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+Gitiles - A simple JGit repository browser
+==========================================
+
+Gitiles is a simple repository browser for Git repositories, built on JGit. Its
+guiding principle is simplicity: it has no formal access controls, no write
+access, no fancy Javascript, etc.