bin/reproducible_pool_buildinfos.sh: improvements to README.txt

Signed-off-by: Holger Levsen <holger@layer-acht.org>

bin/reproducible_pool_buildinfos.sh

@@ -174,9 +174,27 @@ cat > $BASEPATH/README.txt <<- EOF
 buildinfos.debian.net
 =====================
 
-buildinfos.debian.net needs a description here
+Currently, the buildinfo files generated by the Debian buildds are not made
+publicly available for everybody by ftp-master themselves. This service is a
+temporary solution until we find a permanent way for publishing buildinfo
+files: https://bugs.debian.org/763822
+
+This service offers two different views of the buildinfo files as they are
+currently either produced by buildds or by maintainers uploading packages:
+
+ 1. the directory ftp-master.debian.org/ displays the buildinfo files in a
+    date-based view in the same structure as they are (non publicly) stored
+    on coccia.debian.org:/srv/ftp-master.debian.org/buildinfo/
+
+ 2. the directory buildinfo-pool/ arranges these files in a pool-like
+    structure by source package name
+
+The script generating this is copyright 2019-2020 Holger Levsen
+<holger@layer-acht.org> and released under the terms of the GPLv2. Its source
+can be found in the jenkins.debian.net repository:
+
+https://salsa.debian.org/qa/jenkins.debian.net/-/blob/master/bin/reproducible_pool_buildinfos.sh
 
-contact info too
 EOF
 
 # output problems from main structure above