Update ISSUE_TEMPLATE.md

ISSUE_TEMPLATE.md

@@ -1,8 +1,26 @@
-### Basic Info
+To tick a checkbox replace [ ] with [x]. Make sure to replace placeholders (…) accordingly.
 
-- I'm running Cryptomator on: [e.g. Samsung Galaxy S5 with Android 4.4.2 (KitKat)]
-- I'm using Cryptomator in version: [e.g. 0.1]
+## Issue Checklist
 
-### Description
+Before creating a new issue make sure that you
+- [ ] searched [existing (and closed) issues](https://github.com/cryptomator/cryptomator-android/issues).
+- [ ] searched the [knowledge base](https://cryptomator.freshdesk.com/support/solutions).
+- [ ] have read the [contribution guide](https://github.com/cryptomator/cryptomator-android/blob/master/CONTRIBUTING.md).
+- [ ] have read the [Code of Conduct](https://github.com/cryptomator/cryptomator-android/blob/master/CODE_OF_CONDUCT.md).
 
-[description of the bug, question or feature - what did you do? what problem occurred? etc.]
+## Basic Info
+
+This is a
+- [ ] bug report.
+- [ ] feature request.
+- [ ] question or something else.
+
+I'm using Android in version: …
+
+I'm running Cryptomator in version: …  
+(You can check the version in the Cryptomator settings.)
+
+## Description
+
+…  
+(Please describe in detail what you did, what you expected, and what really happened.)