[coco] Initial commit (#686)

This commit creates a working directory for 'coco' project which aims to
build an experimental compiler for IR design.

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

diff --git a/contrib/coco/README.md b/contrib/coco/README.md
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+# coco
+
+_coco_ is an experimental NN compiler based on experimental coarse-grained IR.