add a quick start...

README.md

@@ -13,6 +13,15 @@ perspective.  As a consumer of source, it isn't always guaranteed that
 the project you depend upon will continue to exist in the future.  It
 could also be that older version are removed, etc.
 
+
+Quick start
+-----------
+
+1. Update the file `repos.txt` with a list of urls that you want to mirror.
+2. Run the script `doupdate.sh` to mirror all the repos.
+3. Optionally run `git push --mirror origin` to store the data on the server.
+
+
 Process
 -------