Preferences.md

+Here you can fine-tune our App. To get to the Preferences, press the Preferences-Button:
+
+![Preferences-Button](https://raw.githubusercontent.com/SecUpwN/Android-IMSI-Catcher-Detector/master/SCREENSHOTS/Preferences_Button.png)
+
+The preferences should be self-explanatory.
+
+![Preferences](https://raw.githubusercontent.com/SecUpwN/Android-IMSI-Catcher-Detector/master/SCREENSHOTS/Preferences.png)
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