statement about conditional plugins loading

- bashrc.osh-template has been updated to explain how to
  conditionally load plugins

templates/bashrc.osh-template

@@ -70,6 +70,13 @@ plugins=(
   bashmarks
 )
 
+# Which plugins would you like to conditionally load? (plugins can be found in ~/.oh-my-bash/plugins/*)
+# Custom plugins may be added to ~/.oh-my-bash/custom/plugins/
+# Example format: 
+#  if [ "$DISPLAY" ] || [ "$SSH" ]; then
+#      plugins+=(tmux-autoattach)
+#  fi
+
 source $OSH/oh-my-bash.sh
 
 # User configuration