[ann-ref] Add README.md (#3279)

Let's introduce README.md with a brief introduction.

Signed-off-by: Jonghyun Park <jh1302.park@samsung.com>

diff --git a/contrib/ann-ref/README.md b/contrib/ann-ref/README.md
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+# ann-ref
+
+_ann-ref_ is a reference Android NN API implementation for Linux.
+
+**DISCLAIMER**
+
+_ann-ref_ is incomplete in terms of its functionalities.