Update README.md a little

README.md

@@ -1,2 +1,32 @@
 # A2SERVER
-AppleTalk server for Apple // computers
+AppleTalk server for Apple // computers developed by Ivan Drucker
+
+Documentation here is sparse for the moment; see [Ivan's site]() for
+information about A2SERVER and how it all works.  There's a lot there and it's
+kind of evolved organically over the years just as the scripts themselves
+have, so it's going to be awhile before that information can be backfilled and
+perhaps organized into something you might call a user manual.
+
+Such a manual should not be considered a replacement for Ivan's organic online
+documentation--those contents themselves represent Apple // history, if a
+relatively modern piece of it.  As such they should be preserved as they are.
+
+## Developer note
+
+To use the scripts on a server other than Ivan's, you need to do two things.
+First, the server needs to be modified to serve setup/index.txt and
+update/index.txt the same way they would serve index.html.  How you do that is
+beyond the scope of this repository for the moment.  Secondly, you'll want to
+set the shell variable A2SERVER_SCRIPT_URL to the base URL of this repository
+on your server.  The base-URL should be slash-terminated.  You can then run
+the following snippet:
+
+```bash
+wget a2server-setup ${A2SERVER_SCRIPT_URL}setup/; source a2server-setup
+```
+
+You should probably export A2SERVER_SCRIPT_URL in your .bashrc or whatever
+file configures your development environment.  Also be advised that as of
+version 1.24 of A2SERVER, you must use the snippet above.
+
+[Ivan's site]: http://appleii.ivanx.com/a2server/