added the readme

shaders/ImageBox.vert

@@ -0,0 +1,18 @@
+#version 330 core
+layout (location = 0) in vec2 aPos;
+layout (location = 1) in vec2 aTexCoords;
+
+out vec2 TexCoords;
+
+uniform vec2 normalizedCenterPos;
+uniform vec2 normalizedCenterScale;
+
+uniform float z;
+uniform float rotation;
+
+void main()
+{
+    gl_Position = vec4(normalizedCenterPos + aPos * normalizedCenterScale,0.0f,1.0f);
+
+    TexCoords = aTexCoords;
+}