feat: added HitableInterface for objects that can be hit

src/hitable_interface.hpp

@@ -0,0 +1,12 @@
+#ifndef HITABLE_INTERFACE_HPP
+#define HITABLE_INTERFACE_HPP
+
+namespace godot {
+class Node;
+
+class HitableInterface {
+public:
+    virtual void damage(Node *origin, int amount) = 0; };
+}
+
+#endif // !HITABLE_INTERFACE_HPP