Improve issue reporting workflow.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,20 @@
+---
+name: "\U0001F41E Bug report"
+about: Report a bug
+title: "[Bug]"
+labels: "\U0001F41E bug"
+assignees: ''
+
+---
+
+### Device information
+* Tachiyomi version: ?
+* Android version: ?
+
+## Steps to reproduce
+
+### Expected behavior
+
+### Actual behavior
+
+### Other details

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,15 @@
+---
+name: "🌟 Feature request"
+about: Suggest a feature to improve Tachiyomi
+title: "[Feature Request]"
+labels: "🌟 feature request"
+assignees: ''
+
+---
+### Why/User Benefit/User Problem
+(explain why this feature should be added)
+
+### What/Requirements
+(explain how this feature would behave)
+
+### Acceptance Criteria (how do I know when I’m done?)