feat: add fuzz testing

fuzz/.gitignore

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+target
+corpus
+artifacts

fuzz/Cargo.toml

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+[package]
+name = "org-fuzz"
+version = "0.0.1"
+authors = ["Automatically generated"]
+publish = false
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies.org]
+path = ".."
+[dependencies.libfuzzer-sys]
+git = "https://github.com/rust-fuzz/libfuzzer-sys.git"
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[[bin]]
+name = "fuzz_target_1"
+path = "fuzz_targets/fuzz_target_1.rs"

fuzz/fuzz_targets/fuzz_target_1.rs

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+#![no_main]
+#[macro_use]
+extern crate libfuzzer_sys;
+extern crate org;
+
+use org::Parser;
+
+#[cfg_attr(rustfmt, rustfmt_skip)]
+fuzz_target!(|data: &[u8]| {
+    if let Ok(s) = std::str::from_utf8(data) {
+        let _ = Parser::new(s).collect::<Vec<_>>();
+    }
+});