Add README file.

Mymr/README.md

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+# Myanmar Unicode Keyboard
+
+Experimental code sample of a Myanmar composing keyboard with conversion from Zawgyi font encoding to Unicode.
+
+This is not an official Google product.
+
+## Features
+
+* On-screen ("soft") keyboard for Burmese following Myanmar3 layout.
+* Key character map for physical keyboard, overlaying Myanmar3 layout onto a QWERTY keyboard.
+* Incremental composition of grapheme clusters.
+* Stand-alone library for composing grapheme clusters and serializing them in canonical storage order.
+* Soft key for conversion from Zawgyi. Converts clipboard contents from Zawgyi to Unicode and inserts the resulting Unicode text.
+* Physical keyboard shortcut (Ctrl-Shift-V) for conversion from Zawgyi.
+* Stand-alone library for Zawgyi-to-Unicode conversion.