Add a simple GPU example used in a training slide

test/gpu/native/examples/amd-training/README.md

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+This directory contains a test that I've sent to be used in some AMD trainings.
+Even though it is doing pretty fundamental stuff, It'd be good to get it tested
+nightly.

test/gpu/native/examples/amd-training/basic.chpl

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+var CpuArr: [1..1_000_000] int;        // allocate an array on the host memory
+on here.gpus[0] {                      // move the execution to the GPU
+  var GpuArr = CpuArr;                 // copy the host array onto device memory
+  forall elem in GpuArr do elem += 1;  // increment elements by 1
+  CpuArr = GpuArr;                     // copy the array back to the host
+}
+
+// This was not part of the slide and only there for correctness
+assert((+ reduce CpuArr) == 1_000_000);
+