Update CONTRIBUTING.md

Bug report template

CONTRIBUTING.md

@@ -7,6 +7,30 @@ How to report a bug
 - If the bug only seems to occur with a certain podcast, make sure to include the URL of that podcast.
 - If possible, add instructions on how to reproduce the bug.
 - If possible, add a logfile to your post. This is especially useful if the bug makes the application crash. You can create logfiles with an app like `aLogcat`. Just launch `alogcat`, then start AntennaPod and reproduce the bug. aLogcat should now display information about the bug when you start it.
+- Please use the following **template**: 
+
+**Android version**: 5.x [Especially mention custom roms!]
+
+**Devide model**: 
+
+**Expected behaviour**: 
+
+**Current behaviour**: 
+
+**First occured**: Version 1.x / about x days/weeks ago
+
+**Steps to reproduce**:
+
+1. Do this
+1. Do that
+
+**Environment**: Settings you have changed, e.g. Auto Download. "Unusual" devices you use, e.g. Bluetooth headphones. Do you still use Prestissimo?
+
+**Stacktrace/Logcat**: [if available]
+```
+...
+```
+
 
 How to submit a feature request
 -------------------------------