[AVR] Add a stub README file

llvm-svn: 289326

diff --git a/llvm/lib/Target/AVR/README.md b/llvm/lib/Target/AVR/README.md
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+# AVR backend
+
+This experimental backend is for the 8-bit Atmel [AVR](https://en.wikipedia.org/wiki/Atmel_AVR) microcontroller.
+
+## Useful links
+
+* [Unresolved bugs](https://llvm.org/bugs/buglist.cgi?product=libraries&component=Backend%3A%20AVR&resolution=---&list_id=109466)
+* [Architecture notes](https://github.com/avr-llvm/architecture)