Add game framework and whitebox level

game/assets/shaders/sprite.frag

@@ -0,0 +1,11 @@
+#version 330 core
+in vec2 v_texCoord;
+in vec4 v_color;
+
+uniform sampler2D u_texture;
+
+out vec4 FragColor;
+
+void main() {
+  FragColor = texture(u_texture, v_texCoord) * v_color;
+}