Create issue_template.md

.github/issue_template.md

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+1. Please take a moment to check if the same Bug has already been reported.
+2. Please use our subreddit for general questions: https://www.reddit.com/r/vanillamusic/
+3. Please provide all relevant information below.
+
+**You MUST delete the content above including this line before posting, otherwise your issue may be closed as 'invalid'.**
+
+- Vanilla Music Version (Settings -> About):
+- Android Version:
+- Phone vendor / model:
+- Application was downloaded from (use `[x]`):
+  - [ ] Play Store
+  - [ ] F-Droid
+  - [ ] Other (Nightly Build)
+- Did this work in a previous version?
+  - [ ] Yes
+  - [ ] No
+  - [ ] NA / Don't know.
+
+## Description
+
+....
+
+## Steps to reproduce the issue
+
+...
+
+## Screenshot / Video (If applicable)
+
+...