Add 'pytorch' tag

## Add tag: pytorch

This PR adds the `pytorch` tag to the model repository.

**Changes:**
- Added `pytorch` to model tags
- Updated from 2 to 3 tags

**Current tags:** license:apache-2.0, region:us
**New tags:** license:apache-2.0, region:us, pytorch

README.md

@@ -1,3 +1,7 @@
 ---
 license: apache-2.0
+tags:
+- license:apache-2.0
+- region:us
+- pytorch
 ---