added feedback

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+.idea
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README.md

-# 20200503_GFZ
+# Hackathon 05th March 2020
 
+##
+
+If you have feedback on the hackathon, please let us know [here](feedback.md)
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feedback.md

+# Information
+
+We are currently thinking about planning a next hackathon.
+To provide an optimal experience for all stakeholders, we'd like to gather some information.
+Please make a merge request, if you wish to add your opinion.
+If you agree on an existing bullet point, please add `+1` to the end of the point or increment it to `+2`, `+3`, ...
+If you have other opinions, add a bullet point.
+
+Time considered: autumn 2020
+
+## Feedback
+
+**time frame**
+
+This hackathon was a 1-day workshop.
+Should we change the time frame?
+
+* 1-day 
+* 2-day +1
+
+**location**
+
+We met at GFZ Potsdam.
+Stick to the location?
+
+* GFZ / Telegrafenberg
+* HIDA (Berlin Mitte) +1
+
+**number of participants**
+
+We had about 30 participants.
+should we change the / limit the number of participants
+
+* 30 +1
+* 50 (limit by rooms available)
+
+
+**groups**
+
+We had a group size of about 5.
+Should we change that?
+
+* 3
+* 4 +1
+* 5
+
+**problem to solve**
+
+Last time we had two problems to chose from.
+Should we consider more / less / same number of problems?
+
+* same problem for all +1
+* multiple problems to chose from:
+    * 2
+    * 3
+
+**Additional ideas**
+
+* make it more competitive +1
+* 2-phase work mode: first competitive, then cooperative
+* Secret test set for unified scoring and performance tests between the groups’ solutions +1
+
+**Additional notes**
+
+* the mix out of novices and experienced people was great +1
+* food needs to be labeled if vegetarian / vegan +1