Add fuzzer running on parse_query

parser/fuzz/.gitignore

@@ -0,0 +1,3 @@
+target
+corpus
+artifacts

parser/fuzz/Cargo.toml

@@ -0,0 +1,25 @@
+[package]
+name = "async-graphql-parser-fuzz"
+version = "0.0.0"
+authors = ["Automatically generated"]
+publish = false
+edition = "2018"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+
+[dependencies.async-graphql-parser]
+path = ".."
+
+# Prevent this from interfering with workspaces
+[workspace]
+members = ["."]
+
+[[bin]]
+name = "parse_query"
+path = "fuzz_targets/parse_query.rs"
+test = false
+doc = false

parser/fuzz/fuzz_targets/parse_query.rs

@@ -0,0 +1,6 @@
+#![no_main]
+use libfuzzer_sys::fuzz_target;
+
+fuzz_target!(|data: &str| {
+    async_graphql_parser::parse_query(data);
+});