updating usage on main page

Author: vsoch

pages/docs/user-docs/docs-quick-start-installation.md

@@ -47,6 +47,9 @@ CONTAINER USAGE COMMANDS:
     shell         Run a Bourne shell within container
     test          Execute any test code defined within container
 
+CONTAINER USAGE OPTIONS:
+    -H  --home    Specify $HOME to mount 
+
 CONTAINER MANAGEMENT COMMANDS (requires root):
     bootstrap     Bootstrap a new Singularity image from scratch
     copy          Copy files from your host into the container
@@ -56,6 +59,10 @@ CONTAINER MANAGEMENT COMMANDS (requires root):
     import        Import/add container contents via a tar pipe
     mount         Mount a Singularity container image
 
+CONTAINER REGISTRY COMMANDS:
+    pull          pull a Singularity Hub container to $PWD
+
+
 For any additional help or support visit the Singularity
 website: http://singularity.lbl.gov/
 ```