Issue templates (#1447)

Add templates for issues.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: "🌟 Feature request"
+about: Suggest a feature to improve a source
+title: "[Feature Request] Source name : Short Description"
+labels: "feature request"
+assignees: ''
+
+---
+### What feature should be added to this source?

.github/ISSUE_TEMPLATE/meta_request.md

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+---
+name: "🧠 Meta feature request"
+about: Suggest improvements to the this project
+title: "[Meta]"
+labels: "🧠 meta request"
+assignees: ''
+
+---
+###  Why/Project's Benefit/Existing Problem
+(explain why this should be added)
+
+### Other Details

.github/ISSUE_TEMPLATE/source_bug.md

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+---
+name: "\U0001F41E Bug report"
+about: Report a bug
+title: "[Bug] Source Name : Short Description"
+labels: "bug"
+assignees: ''
+
+---
+
+### Device information
+* Tachiyomi extension version: ?
+* Tachiyomi version: ?
+* Android version: ?
+
+## Steps to reproduce
+1. First Step
+2. Second Step
+
+### Expected behavior
+This should have happened
+
+### Actual behavior
+This happens instead
+
+### Other details

.github/ISSUE_TEMPLATE/source_request.md

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+---
+name: "Source Request"
+about: Suggest a Source for Tachiyomi
+title: "[Source Request] Source Name"
+labels: "Source Request"
+assignees: ''
+
+---
+### Source Website
+The website for this source can be found [here](website_url).
+
+### Other Details