chore: Add fuzz testing README.md

Author: son-oz

fuzz/README.md

@@ -0,0 +1,25 @@
+# Fuzz testing with cargo-fuzz (Experimental)
+
+## Setup
+
+Follow the setup instructions in the [cargo-fuzz documentation](https://rust-fuzz.github.io/book/cargo-fuzz/setup.html)
+
+## Running Fuzz Tests
+
+To run the fuzz tests, use the following command:
+
+* for the `extract_public_key_from_der` target:
+
+  ```bash
+  cargo +nightly fuzz run extract_public_key_from_der
+  ```
+
+## Limitations
+
+* More fuzz targets need to be added.
+* It would be much more efficient to run [structure-aware fuzzing](https://rust-fuzz.github.io/book/cargo-fuzz/structure-aware-fuzzing.html), which requires a custom corpus.
+
+## References
+
+* [https://github.com/rust-fuzz/cargo-fuzz]
+* [https://rust-fuzz.github.io/book/cargo-fuzz.html]