Improve Issue reporting experience (#2189)

* Improve issue reporting workflow.

* Add meta request template

* Remove old template

* Fix label for bug

* Add template text.

* Remove meta request

As per [review](https://github.com/inorichi/tachiyomi/pull/2189#discussion_r321668645)

* Remove Acceptance Criteria

As per [review](https://github.com/inorichi/tachiyomi/pull/2189#discussion_r321665449)

* Requested changes from arkon

All except the default template.

* Revert "Remove old template"

This reverts commit b9ef01f655.

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,24 @@
+---
+name: "🐞 Bug report"
+about: Report a bug
+title: "[Bug] Write short description here"
+labels: "bug"
+
+---
+
+### Device information
+* Tachiyomi version: ?
+* Android version: ?
+
+## Steps to reproduce
+1. First step
+2. Second step
+
+### Expected behavior
+This should happen.
+
+### Actual behavior
+This happened instead.
+
+### Other details
+Additional details and attachments.

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,12 @@
+---
+name: "🌟 Feature request"
+about: Suggest a feature to improve Tachiyomi
+title: "[Feature Request] Write short description here"
+labels: "feature"
+
+---
+### Why/User Benefit/User Problem
+(explain why this feature should be added)
+
+### What/Requirements
+(explain how this feature would behave)