Merge pull request #3 from voidptr127/atnwalk

Create README.md

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+# ATNwalk: Grammar-Based Fuzzing using Only Bit-Mutations
+
+This is a custom mutator integration of ATNwalk that works by communicating via UNIX domain sockets.
+
+Refer to [https://github.com/atnwalk/testbed](https://github.com/atnwalk/testbed) for detailed instructions on how to get ATNwalk running.
+
+## Build
+
+```bash
+gcc -I ../../include/ -shared -fPIC -Wall -O3 atnwalk.c -o atnwalk.so
+```
+
+## Run
+
+**NOTE:** The commands below just demonstrate an example how running ATNwalk looks like and require a working [testbed](https://github.com/atnwalk/testbed)
+
+```bash
+# create the required a random seed first
+mkdir -p ~/campaign/example/seeds
+cd ~/campaign/example/seeds
+head -c1 /dev/urandom | ~/atnwalk/build/javascript/bin/decode -wb > seed.decoded 2> seed.encoded
+
+# create the required atnwalk directory and copy the seed
+cd ../
+mkdir -p atnwalk/in
+cp ./seeds/seed.encoded atnwalk/in/seed
+cd atnwalk
+
+# assign to a single core when benchmarking it, change the CPU number as required
+CPU_ID=0
+
+# start the ATNwalk server
+nohup taskset -c ${CPU_ID} ${HOME}/atnwalk/build/javascript/bin/server 100 > server.log 2>&1 &
+
+# start AFL++ with ATNwalk
+AFL_SKIP_CPUFREQ=1 \
+  AFL_DISABLE_TRIM=1 \
+  AFL_CUSTOM_MUTATOR_ONLY=1 \
+  AFL_CUSTOM_MUTATOR_LIBRARY=${HOME}/AFLplusplus/custom_mutators/atnwalk/atnwalk.so \
+  AFL_POST_PROCESS_KEEP_ORIGINAL=1 \
+  ~/AFLplusplus/afl-fuzz -t 100 -i in/ -o out -b ${CPU_ID} -- ~/jerryscript/build/bin/jerry
+
+# make sure to kill the ATNwalk server process after you're done
+kill "$(cat atnwalk.pid)"
+```