Added a basic mesh shader example

data/shaders/glsl/meshshader/meshshader.frag

@@ -0,0 +1,19 @@
+/* Copyright (c) 2021, Sascha Willems
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ */
+
+#version 450
+ 
+layout (location = 0) in VertexInput {
+  vec4 color;
+} vertexInput;
+
+layout(location = 0) out vec4 FragColor;
+ 
+
+void main()
+{
+  FragColor = vertexInput.color;
+}