Add texture shaders

shader/texture/simpleWorld.frag

@@ -0,0 +1,10 @@
+#version 430 core
+in vec2 vTexPos;
+out vec4 fColor;
+
+uniform sampler2D theTexture;
+
+void main()
+{
+    fColor = texture(theTexture, vTexPos);
+}

shader/texture/simpleWorld.vert

@@ -0,0 +1,12 @@
+#version 430 core
+layout (location = 0) in vec3 pos;
+layout (location = 1) in vec2 texPos;
+out vec2 vTexPos;
+
+uniform mat4 worldMat;
+
+void main()
+{
+  gl_Position = worldMat * vec4(pos,1);
+  vTexPos = texPos;
+}