Create Vulkan demo

vert.glsl

@@ -0,0 +1,20 @@
+#version 450
+
+vec2 positions[3] = vec2[](
+	vec2(0.0, -0.5),
+	vec2(0.5, 0.5),
+	vec2(-0.5, 0.5)
+);
+
+vec3 colours[3] = vec3[](
+	vec3(1.0, 0.0, 0.0),
+	vec3(0.0, 1.0, 0.0),
+	vec3(0.0, 0.0, 1.0)
+);
+
+layout(location = 0) out vec3 frag_colour;
+
+void main() {
+	gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
+	frag_colour = colours[gl_VertexIndex];
+}