Fuzzing for the json decoder

Hey it seems like it's working!

fuzz/.gitignore

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+target
+corpus
+artifacts
+coverage

fuzz/Cargo.toml

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+[package]
+name = "fwd-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+
+[dependencies.fwd]
+path = ".."
+
+[[bin]]
+name = "fuzz_target_1"
+path = "fuzz_targets/fuzz_target_1.rs"
+test = false
+doc = false
+bench = false

fuzz/fuzz_targets/fuzz_target_1.rs

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+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+
+extern crate fwd;
+use fwd::server::refresh::docker::JsonValue;
+
+fuzz_target!(|data: &[u8]| {
+    // fuzzed code goes here
+    let _ = JsonValue::parse(data);
+});