moved gpu example to main

resources/shaders/add.compute

@@ -0,0 +1,12 @@
+#version 450
+
+layout(local_size_x = 64, local_size_y = 1, local_size_z = 1) in;
+
+layout(set = 0, binding = 0) buffer Data {
+    uint data[];
+} data;
+
+void main() {
+    uint idx = gl_GlobalInvocationID.x;
+    data.data[idx] *= 12;
+}