Update README.md

README.md

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 ========
 
 Freifunk Stuttgart specific Gluon configuration
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+
+Doku: https://gluon.readthedocs.org/en/latest/user/site.html
+
+Gluon versions used for specific Stuttgart Freifunk Firmware builds:
+* ffs-0.6: v2016.1
+* ffs-0.5: v2015.1.2