restructure and add server/client example

shared/inc/canvas/Canvas.hpp

@@ -0,0 +1,19 @@
+#include <raylib.h>
+#include "BackGround.hpp"
+#include "Tree.hpp"
+
+class Canvas
+{
+
+public:
+  Canvas() = default;
+  ~Canvas() = default;
+  void init(int size);
+  void deinit();
+  void newGen(RenderTexture2D &target, Dna *dna);
+  bool tick(RenderTexture2D &target);
+
+private:
+  BackGround backGround;
+  Tree tree;
+};