feat(fuzz): Adding cargo-fuzz targets for load_file and parse_command.

FUZZING.md

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+# Fuzzing
+
+There are currently two fuzzing targets for the `dz6` crate: `app_load_file`, which fuzz test the hex editor's ability to open and load files from the filesystem, and `commands_parse_command`, which tests the ability to correctly parse commands in the TUI.
+
+## Dictionaries
+
+A [dictionary](https://appsec.guide/docs/fuzzing/techniques/dictionary/) for valid `dz6` commands can be found in `fuzz/dict/commands.dict`. Passing one dictionary to libFuzzer lets it splice whole keywords and punctuation into inputs instead of rediscovering them one byte at a time, significantly improving coverage and efficiency.
+
+# Fuzzing a target
+
+In order to run a target, you will need to install [cargo-fuzz](https://rust-fuzz.github.io/book/introduction.html) via:
+
+```
+$ rustup install nightly
+$ cargo install cargo-fuzz
+```
+
+Next, go to the `fuzz/` directory, and run:
+
+```
+$ cargo fuzz run [target]
+```
+
+Additionally, you can fuzz the command parser target together with its dictionary by invoking:
+
+```
+$ cargo fuzz run commands_parse_command -- -dict=dict/commands.dict
+```
+
+The path is relative to the directory you run the command from. libFuzzer reports how many entries it loaded at startup.
+
+> Fuzzing speed can be improved by disabling [ASan](https://github.com/google/sanitizers/wiki/addresssanitizer), which can be done by running `cargo fuzz run -s none [target]`.

fuzz/.gitignore

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+target
+corpus
+artifacts
+coverage