Add a contributors file (#3)

Author: michellesanver

CONTRIBUTORS.md

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+Metadata-Parser is the result of the work of many people who made the code, the documentation and anything around it better. 
+
+Thank you for your work.
+
+These are the people who in any way contributed to the project (in no particular order): 
+David Buchmann (dbu)
+Michelle Sanver (michellesanver)
+Rae Knowler (bellisk)
+Tobias Schultze (Tobion)
+Christian Riesen (ChristianRiesen)
+Martin Sanser (mjanser)
+Emanuele Panzeri (thePanz)