feat: with example code

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/crunch-codegen/Cargo.toml

@@ -17,3 +17,9 @@ prost.workspace = true
 prost-types.workspace = true
 prost-build.workspace = true
 bytes.workspace = true
+tempfile.workspace = true
+genco.workspace = true
+walkdir.workspace = true
+
+[dev-dependencies]
+pretty_assertions.workspace = true