Issue template overhaul

.github/ISSUE_TEMPLATE/3_site_feature_request.md

@@ -0,0 +1,37 @@
+---
+name: Site feature request
+about: Request a new functionality for a site
+title: ''
+---
+
+<!--
+
+######################################################################
+  WARNING!
+  IGNORING THE FOLLOWING TEMPLATE WILL RESULT IN ISSUE CLOSED AS INCOMPLETE
+######################################################################
+
+-->
+
+
+## Checklist
+
+<!--
+Carefully read and work through this check list in order to prevent the most common mistakes and misuse of youtube-dl:
+- First of, make sure you are using the latest version of youtube-dl. Run `youtube-dl --version` and ensure your version is 2019.04.24. If it's not, see https://yt-dl.org/update on how to update. Issues with outdated version will be REJECTED.
+- Search the bugtracker for similar site feature requests: http://yt-dl.org/search-issues. DO NOT post duplicates.
+- Finally, put x into all relevant boxes (like this [x])
+-->
+
+- [ ] I'm reporting a site feature request
+- [ ] I've verified that I'm running youtube-dl version **2019.04.24**
+- [ ] I've searched the bugtracker for similar site feature requests including closed ones
+
+
+## Description
+
+<!--
+Provide an explanation of your site feature request in an arbitrary form. Please make sure the description is worded well enough to be understood, see https://github.com/ytdl-org/youtube-dl#is-the-description-of-the-issue-itself-sufficient. Provide any additional information, suggested solution and as much context and examples as possible.
+-->
+
+WRITE DESCRIPTION HERE