Add issue templates

.github/ISSUE_TEMPLATE/Bug_report.md

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+---
+name: Bug report
+about: Create a bug report for the Next.js core
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior, please provide code snippets or a repository:
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**System information**
+ - OS: [e.g. macOS, Windows]
+ - Browser (if applies) [e.g. chrome, safari]
+ - Version of Next.js: [e.g. 6.0.2]
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/Custom.md

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+---
+name: Request to be added to the showcase on nextjs.org
+about: Apply for your project to be added to nextjs.org
+
+---
+
+- Name of company:
+- Url:
+- Testimonial about Next.js (optional):

.github/ISSUE_TEMPLATE/Feature_request.md

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+---
+name: Feature request
+about: Create a feature request for the Next.js core
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what you want and what your use case is.
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.