Change git repo url from SSH to HTTPS

The change is made for researchers to easly clone the project to check out from systems and platforms with SSH not in sync with github. Eg : Google Colab, Remote GPU Servers etc

README.md

@@ -17,7 +17,7 @@
 Please install SAM 2 on a GPU machine using:
 
 ```bash
-git clone git@github.com:facebookresearch/segment-anything-2.git
+git clone https://github.com/facebookresearch/segment-anything-2.git
 
 cd segment-anything-2; pip install -e .
 ```