chore(nvm): add install script for nvm

setup/nvm.sh

@@ -0,0 +1,14 @@
+ #!/bin/sh
+
+ # Manual install of nvm
+git clone https://github.com/creationix/nvm.git ~/.nvm
+cd ~/.nvm
+git checkout `git describe --abbrev=0 --tags`
+cd ~/.dotfiles/
+
+# Reload nvm into this environment
+export NVM_DIR="$HOME/.nvm/"
+[ -s "$NVM_DIR/nvm.sh" ] && . "$NVM_DIR/nvm.sh"  # This loads nvm
+
+nvm install stable
+nvm alias default stable