DOC: Add benchmark/README.md

Author: kernc

benchmark/README.md

@@ -0,0 +1,11 @@
+SAMBO Optimization Benchmark
+============================
+This package compares [SAMBO](https://sambo-optimization.github.io)
+to popular optimization `methods.py` by running the algorithms on 
+test objective `funcs.py`.
+
+Run in project root:
+```shell
+python -m benchmark |
+    tee benchmark-$(date --iso-8601=minutes).txt
+```