Add noncommercial licensing and Stage 2 snapshot

metrics/stage2_step_0006000_metrics.json

@@ -0,0 +1,10 @@
+{
+  "metrics": {
+    "eval/decoded_mse": 0.018432566523551942,
+    "eval/decoded_psnr": 23.364741813713323,
+    "eval/latent_loss": 0.23828116178512573,
+    "eval/latent_mse": 0.5348482084274292,
+    "eval/num_images": 100.0
+  },
+  "step": 6000
+}