Splitting up docs

doc/vim/manage_plugins.md

@@ -0,0 +1,12 @@
+YADR comes with a dead simple plugin manager that just uses vundles and submodules, without any fancy config files.
+
+Add a plugin
+
+    yav -u https://github.com/airblade/vim-rooter
+
+Delete a plugin 
+
+    ydv -u airblade/vim-rooter
+
+The aliases (yav=yadr vim-add-plugin), (ydp=yadr vim-delete-plugin) and (yuv=yadr vim-update-all-plugins) live in the aliases file.
+You can then commit the change. It's good to have your own fork of this project to do that.