Added README

README.md

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+nench.sh ("new bench.sh")
+=========================
+
+- based on the established freevps.us/bench.sh
+- modified to include CPU and ioping measurements and to reduce the number of
+  speedtests while retaining useful European and North American POPs
+
+Usage example
+-------------
+
+```
+(curl bench.wget.racing | bash; curl bench.wget.racing | bash) | tee nench.log
+```