Adjustments for F-Droid readiness (#21)

* Replace app icon

* Adjust f-droid fastlane infos

Author: tejado

README.md

@@ -1,6 +1,6 @@
 # USB Gadget Tool
 
-<img src="static/usb-gadget-tool-3.png" align="right" height="500" alt="USB Gadget Tool Screenshot">  
+<img src="fastlane/metadata/android/en-US/images/phoneScreenshots/usb-gadget-tool-3.png" align="right" height="500" alt="USB Gadget Tool Screenshot">  
 
 Convert your Android phone to any USB device you like!  
 USB Gadget Tool allows you to create and activate USB device roles, like a mouse or a keyboard. Connected USB hosts (e.g. a normal computer) will then identify your Android device only under that role.

app/src/main/ic_launcher-playstore.png

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@drawable/ic_launcher_background" />
-    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <background android:drawable="@color/ic_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
 </adaptive-icon>

app/src/main/res/drawable/ic_launcher_background.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@drawable/ic_launcher_background" />
-    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+    <background android:drawable="@color/ic_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
 </adaptive-icon>

app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="ic_launcher_background">#FFFFFF</color>
+</resources>

app/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1 @@
+USB Gadget Tool