added Yoga and TinyXML2 libraries and created a testing layout.xml

engine/app.cpp

@@ -52,6 +52,12 @@ void App::init()
         "void main(){"
         "   frag = col;"
         "}";
+
+    tinyxml2::XMLDocument xml;
+    auto ret = xml.LoadFile("data\\layout.xml");
+    auto root = xml.RootElement();
+//    root->
+
     shader.create(shader_v, shader_f);
     shader_color.create(shader_color_v, shader_color_f);
     shader_uv.create(shader_v, shader_uv_f);

engine/pch.h

@@ -25,3 +25,7 @@
 #include <glm/gtc/type_ptr.hpp>
 #include <glm/gtx/rotate_vector.hpp>
 #include <glm/gtx/euler_angles.hpp>
+
+#include <tinyxml2.h>
+#include <yoga/Yoga.h>
+#include <yoga/Yoga.h>