Update README.md (#6)

- Update README.md (c5392485fd305a6626173932fc50f6e21f79c8b2)

README.md

@@ -82,6 +82,12 @@ pip install elastic_models[nvidia]\
  --extra-index-url https://pypi.nvidia.com\
  --extra-index-url https://pypi.org/simple
 
+# or for blackwell support
+pip install elastic_models[blackwell]\
+ --index-url https://thestage.jfrog.io/artifactory/api/pypi/pypi-thestage-ai-production/simple\
+ --extra-index-url https://pypi.nvidia.com\
+ --extra-index-url https://pypi.org/simple
+
 pip install flash_attn==2.7.3 --no-build-isolation
 pip uninstall apex
 ```