Moved fuzz dir to test/fuzz

Extended contributing document to testing and licensing

test/fuzz/backend/README.md

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+# Clixon fuzzing
+
+This dir contains code for fuzzing clixon backend.  (NOTE DOES NOT WORK)
+
+It requires the preeny package to change sockets to stdio. 
+
+Plugins do not work
+
+## Prereqs
+
+Install AFL and preeny, see [..](..)
+
+## Build
+
+Make a modification to how Clixon sends internal messages in `include/clixon_custom.h`:
+```
+  #define CLIXON_PROTO_PLAIN
+```
+(Note this is obsolete)
+
+Build clixon statically with the afl-clang compiler:
+```
+  CC=/usr/bin/afl-clang-fast LINKAGE=static ./configure --with-restconf=evhtp
+  make clean
+  make
+  sudo make install
+```
+
+## Run tests
+
+Populate the input/ dir with input usecases, there are two examples already in this dir that can be modified.
+Use the script `runfuzz.sh` to run one test:
+```
+  ./runfuzz.sh
+```
+
+After (or during) the test, investigate results in the output dir.