Added custom colors

shaders/frag.frag

@@ -1,7 +1,11 @@
 #version 450
 layout(location = 0) out vec4 outColor;
 
+layout(push_constant) uniform PC {
+    vec4 color;
+} pc;
+
 void main()
 {
-    outColor = vec4(1.0, 0.0, 0.0, 1.0); // red
+    outColor = pc.color;
 }