added initial defork example

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diff --git a/examples/defork/README.md b/examples/defork/README.md
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+# defork
+
+when the target forks, this breaks all normal fuzzing runs.
+Sometimes, though, it is enough to just run the child process.
+If this is the case, then this LD_PRELOAD library will always return 0 on fork,
+the target will belive it is running as the child, post-fork.
+
+This is defork.c from the amazing preeny project
+https://github.com/zardus/preeny
+
+It is altered for afl++ to work with its fork-server: the initial fork will go through, the second fork will be blocked.