Extend ClusterFuzzLite README

Signed-off-by: David Korczynski <david@adalogics.com>

Author: DavidKorczynski

.clusterfuzzlite/README.md

@@ -1,4 +1,19 @@
 # ClusterFuzzLite set up
 
 This folder contains a fuzzing set for [ClusterFuzzLite](https://google.github.io/clusterfuzzlite).
-        
+
+## Running fuzzing locally
+
+To reproduce this set up the way ClusterFuzzLite does it (by way of [OSS-Fuzz](https://github.com/google/oss)) you can do:
+
+```sh
+git clone https://github.com/google/oss-fuzz
+git clone https://github.com/ben-strasser/fast-cpp-csv-parser
+cd fast-cpp-csv-parser
+
+# Build the fuzzers in .clusterfuzzlite
+python3 ../oss-fuzz/infra/helper.py build_fuzzers --external $PWD
+
+# Run the fuzzer for 180 seconds
+python3 ../oss-fuzz/infra/helper.py run_fuzzer --external $PWD parse_fuzzer-- -max_total_time=180
+```