message: doc: Document how to fuzz Bitcoin Core using honggfuzz
diff: @@ -133,3 +133,25 @@ $ afl/afl-fuzz -i inputs/ -o outputs/ -- src/test/fuzz/bech32
  ```
  Read the [`afl-fuzz` documentation](https://github.com/google/afl) for more information.
  +
  +# Fuzzing Bitcoin Core using Honggfuzz
  +
  +## Quickstart guide
  +
  +To quickly get started fuzzing Bitcoin Core using [Honggfuzz](https://github.com/google/honggfuzz):
  +
  +```sh
  +$ git clone https://github.com/bitcoin/bitcoin
  +$ cd bitcoin/
  +$ ./autogen.sh
  +$ git clone https://github.com/google/honggfuzz
  +$ cd honggfuzz/
  +$ make
  +$ cd ..
  +$ CC=$(pwd)/honggfuzz/hfuzz_cc/hfuzz-clang CXX=$(pwd)/honggfuzz/hfuzz_cc/hfuzz-clang++ ./configure --enable-fuzz --with-sanitizers=address,undefined
  +$ make
  +$ mkdir -p inputs/
  +$ honggfuzz/honggfuzz -i inputs/ -- src/test/fuzz/process_message
  +```
  +
  +Read the [Honggfuzz documentation](https://github.com/google/honggfuzz/blob/master/docs/USAGE.md) for more information.
  