Added headless rendering example

Refs #331

data/shaders/renderheadless/triangle.frag

@@ -0,0 +1,10 @@
+#version 450
+
+layout (location = 0) in vec3 inColor;
+
+layout (location = 0) out vec4 outFragColor;
+
+void main() 
+{
+  outFragColor = vec4(inColor, 1.0);
+}

data/shaders/renderheadless/triangle.vert

@@ -0,0 +1,20 @@
+#version 450
+
+layout (location = 0) in vec3 inPos;
+layout (location = 1) in vec3 inColor;
+
+layout (location = 0) out vec3 outColor;
+
+out gl_PerVertex {
+	vec4 gl_Position;   
+};
+
+layout(push_constant) uniform PushConsts {
+	mat4 mvp;
+} pushConsts;
+
+void main() 
+{
+	outColor = inColor;
+	gl_Position = pushConsts.mvp * vec4(inPos.xyz, 1.0);
+}