[nest] Initial commit (#625)

This commit create a workspace for a lightweight nested loop generation
library named 'nest'.

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

diff --git a/contrib/nest/README.md b/contrib/nest/README.md
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+# nest
+
+_nest_ is a lightweight nested loop generation library, which makes it easy to generate complex,
+optimized nested loops (such as loops in conv2d).
+
+## References
+- [Halide](https://github.com/halide/Halide)
+- [Tensor Comprehension](https://github.com/facebookresearch/TensorComprehensions)