📝 ppn2ocr: Add to README, including proxy configuration

README.md

@@ -55,3 +55,23 @@ available:
 ~~~
 firefox OCR-D-OCR-CALAMARI-EVAL/OCR-D-OCR-CALAMARI-EVAL_00000024.html
 ~~~
+
+ppn2ocr
+-------
+The `ppn2ocr` script produces OCR output for a given document in the State
+Library Berlin (SBB)'s digitized collection. The document must be specified by its
+PPN, for example:
+~~~
+./ppn2ocr PPN77164308X
+~~~
+
+This produces a workspace directory `PPN77164308X` with the OCR results in it;
+the results are viewable as explained above.
+
+ppn2ocr requires a working Docker setup and properly set up environment
+variables for the proxy configuration. At SBB, this means:
+~~~
+export HTTP_PROXY=http://http-proxy.sbb.spk-berlin.de:3128/
+export HTTPS_PROXY=$HTTP_PROXY; export http_proxy=$HTTP_PROXY; export https_proxy=$HTTP_PROXY
+export no_proxy=localhost,digital.staatsbibliothek-berlin.de,content.staatsbibliothek-berlin.de
+~~~

ppn2ocr

@@ -67,9 +67,6 @@ $self_dir/run-docker-hub -I PRESENTATION --skip-validation
 
 # TODO
 
-# * README: Users must configure their proxy properly via environment variables;
-#   This includes setting no_proxy (e.g. for use at SBB).
-
 # my_ocrd_workflow
 # ----------------
 # * Need option to add volumes e.g. /srv/digisam_images