Update README.md

scripts/benchmarks/README.md

@@ -5,3 +5,7 @@ These benchmarks test how fast emotion renders with react components. They do no
 To run these benchmarks, visit https://benchmarks.emotion.sh and choose a commit. (If a benchmark says artifact not found, that means the build hasn't finished yet and you have to wait or the build may have failed)
 
 These benchmarks are a modified version of react-native-web's benchmarks.
+
+## Running Locally
+
+The benchmarks can also be run locally, in this folder run `yarn build` and then `open ./dist/index.html` or use `yarn run-benchmark` to run them automatically.