Contributors.md

+#This is our liste of contributors:
+
+##Developers
+###Active
+- Gerrit Erichsen (Lead Developer)
+- Tobias Zimmermann (Core Developer)
+###Inactive
+- Tobias Becke (Development Solar Power Calculation)
+
+##Contributors
+###Active
+- Béla Wiegel (Map representation/GUI)
+###Inactive
+- Tobias Cors (Master thesis, Improvement of MILP model)
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