Add documentation for caching pip packages

docs/buckets/pip.md

@@ -0,0 +1,15 @@
+# [pip](https://pip.pypa.io/)
+
+Compatible with probably any type of linux guest distro, will hook into pip's
+http and wheels cache directory under `$HOME/.cache/pip/http` and `$HOME/.cache/pip/wheels` as
+the default SSH user (usually `vagrant`) on your guest.
+
+To manually enable it:
+
+```ruby
+Vagrant.configure("2") do |config|
+  config.vm.box = 'some-box-with-pip-installed'
+  config.cache.enable :pip
+end
+```
+

docs/template.html

@@ -96,6 +96,7 @@
                   <li><a tabindex="-1" href="buckets/rvm">rvm</a></li>
                   <li><a tabindex="-1" href="buckets/yum">Yum</a></li>
                   <li><a tabindex="-1" href="buckets/zypper">Zypper</a></li>
+                  <li><a tabindex="-1" href="buckets/pip">pip</a></li>
                 </ul>
               </li>
               <li>