add vcm format loader

src/coders/vcm.hpp

@@ -0,0 +1,12 @@
+#pragma once
+
+#include <memory>
+#include <string>
+
+namespace model {
+    struct Model;
+}
+
+namespace vcm {
+    std::unique_ptr<model::Model> parse(std::string_view file, std::string_view src);
+}