Create issue templates

Author: TiagoCavalcante

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+1. Run the code '...'
+2. Zoom out '....'
+3. See error
+
+Don't forget to "dry" the code as much as you can. Is it the smallest example that reproduces the bug?
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**Live example**
+If there are many steps to reproduce the bug, it is recommended to add a live example, do you know [JSFiddle](https://jsfiddle.net/)?
+
+**Version (please complete the following information):**
+ - Browser [e.g. stock browser, safari]
+ - Version [e.g. 1.1.0]

.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.
+
+**Note**: questions should be posted [in the discussions](https://github.com/Mathics3/mathics-threejs-backend/discussions).