Update 'bericht/lennart/references.bib'

Add RedMatic installation manual

bericht/lennart/references.bib

@@ -31,4 +31,13 @@
     month = "Juni",
     howpublished = {https://github.com/alexreinert/piVCCU/blob/master/docs/setup/raspberrypi.md},
     note = "[Online; aufgerufen 30-08-2019]"
+}
+
+@misc {sebastianraff2019redmaticinstallation,
+    author = "Sebastian Raff",
+    title = "Installation",
+    year = "2019",
+    month = "März",
+    howpublished = {https://github.com/rdmtc/RedMatic/wiki/Installation},
+    note = "[Online; aufgerufen 10-09-2019]"
 }