restructure and add server/client example

app/src/main.cpp

@@ -0,0 +1,48 @@
+#include <raylib.h>
+#include "App.hpp"
+
+#if defined(PLATFORM_WEB)
+#include <emscripten/emscripten.h>
+#endif
+
+static App app;
+
+void UpdateDrawFrame()
+{
+  app.update();
+  BeginDrawing();
+  app.draw();
+  EndDrawing();
+}
+
+int main(void)
+{
+  char name[] = "treender";
+  int screenWidth = 600;
+  int screenHeight = 800;
+
+#ifdef PLATFORM_ANDROID
+  InitWindow(0, 0, name);
+  screenWidth = GetScreenWidth();
+  screenHeight = GetScreenHeight();
+#else
+  InitWindow(screenWidth, screenHeight, name);
+#endif
+
+  app.init(screenWidth, screenHeight);
+
+#if defined(PLATFORM_WEB)
+  emscripten_set_main_loop(UpdateDrawFrame, 0, 1);
+#else
+  SetTargetFPS(60);
+  while (!WindowShouldClose())
+  {
+    UpdateDrawFrame();
+  }
+#endif
+
+  app.deinit();
+
+  CloseWindow();
+  return 0;
+}