Add coin animation

mario/blocks/coinblock.hpp

@@ -0,0 +1,15 @@
+#ifndef COIN_BLOCK_HPP
+#define COIN_BLOCK_HPP
+
+#include "../blocks.hpp"
+
+class CoinBlock : public MarioBlock {
+public:
+    CoinBlock( int x, int y, std::shared_ptr< SDLPP::Renderer > renderer );
+    virtual void custom_move(int ticks) override;
+    void setParent(MarioBlock *parent);
+private:
+    MarioBlock *_parent;
+};
+
+#endif