chore: Add issue templates

close #246

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Is something not working as intended? Report it here.
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+### Bug description
+A clear and concise description of what the bug is.
+
+### Reproduction steps
+Steps to reproduce the behavior:
+1. 
+2.
+3.
+...
+
+### Expected behavior 
+A clear and concise description of what you expected to happen.
+
+### Relevant code
+If applicable, add code snippets to help explain your problem.
+
+### Environment (please complete the following information):
+**WhatsApp**
+ - Account type [Standard / Business]:
+ - Device OS [iOS / Android]:
+ - WhatsApp Web version [run `await client.getWWebVersion()`]:
+
+**Library**
+ - Browser [Chrome / Chromium]:
+ - NodeJS version (`node -v`):
+ - npm or yarn version (`npm -v`):
+ - whatsapp-web.js version:
+
+### Additional context
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**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.