Missing README

Author: dpc

fuzz/README.md

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+# Fuzzer for smallvec
+
+Based on fuzzing in [rust-bitcoin](https://github.com/rust-bitcoin/rust-bitcoin/tree/c8ac25219a09bf9d017f1b05abe3e746e2136f73/fuzz)
+
+Useful links:
+
+## Running manually with afl
+
+```
+cargo afl build --release --bin smallvec_ops --features afl   && cargo afl fuzz -i in -o out target/release/smallvec_ops
+```
+
+* https://rust-fuzz.github.io/book/afl.html