chore: add issue templates

.github/ISSUE_TEMPLATE/BUG_REPORT.md

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+---
+name: Bug report
+about: Report a problem and help us fix it.
+labels: "bug"
+---
+
+
+### Describe the Bug
+
+<!-- A clear and concise description of what the bug is. -->
+
+
+### Steps to Reproduce
+
+1. do this
+2. do that
+
+<!--
+If you report a modeling related issue, ensure you can reproduce it on [demo.bpmn.io](https://demo.bpmn.io/new)
+
+When reporting a library error, try to build an example that reproduces your problem. You can use our playgrounds for [viewer](https://jsfiddle.net/07envcu1/) or [modeler](https://jsfiddle.net/bg97r61t/) as a starting point or put a demo up on [GitHub](https://github.com/) for inspection.
+-->
+
+### Expected Behavior
+
+<!-- A clear and concise description of what you expected to happen. -->
+
+
+### Environment
+
+ - Browser: [e.g. IE 11, Chrome 69]
+ - OS: [e.g. Windows 7]
+ - Library version: [e.g. 2.0.0]

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.md

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+---
+name: Feature request
+about: Suggest an idea or general improvement.
+labels: "enhancement"
+---
+
+
+### 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.

.github/ISSUE_TEMPLATE/TASK.md

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+---
+name: Task
+about: Describe a generic activity we should carry out.
+---
+
+
+### What should we do?
+
+<!-- Clearly describe the activity we should carry out. -->
+
+
+### Why should we do it?
+
+<!-- Argue why doing it is a healthy investment of our time. -->

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false