add checkout verb, to make bite-sized git repos

This allows you to create a repo as a child of asp's, which you can
modify as you wish, and continue to pull changes from after calling
'abs update'. One might create a new remote for this repo in which
to publish their own downstream branch.

1 files changed, 6 insertions, 0 deletions

diff --git a/README.md b/README.md
index 2671a9f..177d8ff 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,12 @@ Get the source files for some packages:
 asp export pacman testing/systemd extra/pkgfile
 ~~~
 
+Get a fully functional git checkout of a single package:
+
+~~~
+asp checkout pkgfile
+~~~
+
 List the repositories a package has been pushed to:
 
 ~~~