Add more granular github issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a bug report
+---
+
+<!-- ⚠️ Please search existing issues to avoid creating duplicates. ⚠️ -->
+<!-- Describe the bug here. -->
+
+## Details
+- Browser and browser version: 
+- OS version: 
+- xterm.js version: 
+
+### Steps to reproduce
+
+1. 
+2. 

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest a feature or enhancement
+---
+
+<!-- ⚠️ Please search existing issues to avoid creating duplicates. ⚠️ -->
+<!-- Describe the enhancement here. -->

.github/ISSUE_TEMPLATE/question.md

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+---
+name: Question
+about: The issue tracker is not for questions. Please ask questions on https://stackoverflow.com/questions/tagged/xtermjs or https://gitter.im/sourcelair/xterm.js.
+---
+
+🛑 The issue tracker is not for questions 🛑
+
+If you have a question, please ask it on https://stackoverflow.com/questions/tagged/xtermjs or https://gitter.im/sourcelair/xterm.js.