Add bundle/puppet-ext-vim (manually extracted the subtree the pupet repo)

Commands used:

    git fetch https://github.com/puppetlabs/puppet
    tree=$( git ls-tree --full-tree 90aad3fff7d270ef2683f486cdf999c003510cf0 ext/vim | cut -f1 | cut -d' ' -f3 )
    git read-tree --prefix=bundle/puppet-ext-vim $tree