removed flecs and setted up vulkan building

assets/shaders/shader.metal

@@ -0,0 +1,9 @@
+vertex float4 basic_vertex(                           // 1
+  const device packed_float3* vertex_array [[ buffer(0) ]], // 2
+  unsigned int vid [[ vertex_id ]]) {                 // 3
+  return float4(vertex_array[vid], 1.0);              // 4
+}
+
+fragment half4 basic_fragment() { // 1
+  return half4(1.0);              // 2
+}