Add instruction manual for automated screenshots via debugbadger

fastlane/SCREENSHOT.md

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+Prompt for automatic screenshots via /debugbadger:screenshots
+
+First open the app and ensure we start out on "light mode".
+If we are not using the current theme, you can change it via Settings>General>Theme mode
+
+Create a total of 8 phone screenshots in the following order:
+
+* Dashboard in "Light Theme"
+  * This is always the starting point.
+* Dashboard in "Dark Theme"
+  * Change the theme back to "Light Theme" after taking the screenshot.
+* Device Profiles Page
+  * Click the device "Configure" icon the toolbar on the dashbaord to reach it.
+* Add new device profile page
+  * Reach it by pressing the FAB (bottom right corner) on the device profiles page.
+* Settings Index Screen
+  * Can be reached via settings icon in the dashboard toolbar.
+* Reaction Settings Screen
+  * Reached via "Reactions" entry on the settings index screen.
+* Widgets in launcher
+  * Press the device home button or completely close the app
+  * The widgets will be on the launchers center workspace
+* Widget config screen
+  * Long press the widget, then release it and press the edit icon in the widget
+  * If there are more than 1 widget, pick any of them