Add a dev crate to run the File parser
diff --git a/dev/main.rs b/dev/main.rs
new file mode 100644
index 0000000..eb67546
--- /dev/null
+++ b/dev/main.rs
@@ -0,0 +1,4 @@
+syn_dev::r#mod! {
+    // Write Rust code here and run `cargo check` to have Syn parse it.
+
+}