add missing lib

lib/ArduinoJson/fuzzing/fuzz.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+# This script mimics an invocation from https://github.com/google/oss-fuzz
+
+cd $(dirname $0)
+export CXX='clang++'
+export CXXFLAGS='-fsanitize-coverage=trace-pc-guard -fsanitize=address'
+export LIB_FUZZING_ENGINE=-lFuzzer
+make OUT=.
+./json_fuzzer my_corpus seed_corpus -max_len=1024 -timeout=10