add ultralyticsplus config

config.json

@@ -0,0 +1 @@
+{"input_size": 640, "task": "instance-segmentation", "ultralyticsplus_version": "0.0.21", "ultralytics_version": "8.0.20", "model_type": "v8", "score_map50": 0.62261, "score_map50_mask": 0.61275}