'README.md' updaten

README.md

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 Work in progress for the Reclaiming Digital Infrastructures event series.
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 # Reclaiming Digital Infrastructures - documentation
+
+* Uses Flask, Etherpad-lite, Etherpump, Paged.js, Pandoc
+* Runs on port `5588`
+
+# Debugging
+
+* To restart the flask application: `sudo supervisorctl restart rdi`
+* To kill the flask application, when it triggers an "address already in use" error: `sudo netstat -nlp | grep 5588` + `kill 12345`