Add shaders that will just return positional information

shader/posTwoD/basic.vert

@@ -0,0 +1,9 @@
+#version 430 core
+layout (location = 0) in vec3 position;
+layout (std140, binding = 0) uniform TheMat { mat4 theMat; } ;
+out vec4 vColor;
+void main()
+{
+  gl_Position = theMat * vec4(position,1);
+  vColor = vec4(position,1);
+}