[libfuzzer] First part of libfuzzer-chrome documentation.

testing/libfuzzer/README.md

Index: testing/libfuzzer/README.md
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+# Libfuzzer in Chrome
+
+[g.co/libfuzzer-chrome]
+
+This directory contains integration between [LibFuzzer] and Chrome.
+Libfuzzer is an in-process coverage-driven evolutionary fuzzer. It helps
+engineers to uncover potential security & stability problems earlier.
+
+*** note
+**Requirements:** libfuzzer in chrome is supported with GN on Linux only. 
+***
+
+## Integration Status
+
+Fuzzer tests are well-integrated with Chrome build system & distributed 
+ClusterFuzz fuzzing system. Cover bug: [crbug.com/539572].
+
+## Documentation
+
+* [Getting Started Guide] walks you through all the steps necessary to create
+your fuzzer and submit it to ClusterFuzz.
+* [Efficient Fuzzer Guide] explains how to measure fuzzer effectiveness and
+ways to improve it.
+* [ClusterFuzz Integration] describes integration between ClusterFuzz and 
+libfuzzer.
+
+
+[LibFuzzer]: http://llvm.org/docs/LibFuzzer.html
+[crbug.com/539572]: https://bugs.chromium.org/p/chromium/issues/detail?id=539572
+[Getting Started Guide]: ./getting_started.md
+[Efficient Fuzzer Guide]: ./efficient_fuzzer.md
+