Add issue templates

Author: yuriy-fix

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: "\U0001F41B Bug Report"
+about: "Please report issues related to the TypeScript and HTML API of Vaadin components here."
+title: ''
+labels: 'i: needs triage'
+assignees: ''
+
+---
+
+<!--
+  Please fill out each section below, otherwise, your issue risks taking an infinite amount of time to triage. This info allows the maintainers team to diagnose and fix your issue as quickly as possible.
+
+  Before opening a new issue, please search existing issues: https://github.com/vaadin/web-components/issues.
+-->
+
+### Description
+
+Describe the issue that you're seeing.
+
+<!-- Example: The `vaadin-grid` element scrolls when applying filter. -->
+
+### Expected outcome
+
+What should happen?
+
+<!-- Example: No scrolling should happen. -->
+
+### Actual outcome
+
+What happened.
+
+<!-- Example: Grid content occasionally gets scrolled. -->
+
+### Live Demo
+
+A screenshot or video with issue reproduced.
+
+### Minimal reproducible example
+
+**Please** provide a code snippet with issue reproduction, this makes your issue _much_ easier to diagnose.
+
+<!--
+```
+<vaadin-grid</vaadin-grid>
+```
+```
+const grid = document.querySelector('vaadin-grid');
+grid.items = items;
+```
+-->
+
+### Steps to reproduce
+
+Clear steps describing how to reproduce the issue.
+
+<!-- Example
+1. Put a `vaadin-grid` element in the page.
+2. Add `vaadin-grid-filter` element to the column header template.
+3. Open the page in a web browser.
+4. Start typing in the filter input.
+-->
+
+### Environment
+
+- Version of the webcomponent / platform.
+- OS.
+
+<!-- Example:
+- v20.0.0
+- OSX 10.13.4
+-->
+
+### Browsers Affected
+<!-- Check all that apply -->
+- [ ] Chrome
+- [ ] Firefox
+- [ ] Safari
+- [ ] Edge
+- [ ] IE 11
+- [ ] iOS Safari
+- [ ] Android Chrome

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: "\U0001F680 Feature Request"
+about: "I have a specific suggestion for the TypeScript and HTML API of Vaadin components!"
+title: ''
+labels: 'i: needs triage'
+assignees: ''
+
+---
+
+### Describe a problem you proposal is addressing
+
+A concise description of what the problem or reason is. For example, I'm always frustrated when [...]
+
+### Describe the solution you'd like
+
+Provide a clear and concise description of what you want to happen.
+
+### Describe alternatives you've considered
+
+Provide information about other solutions you've tried or researched.
+
+### Additional context
+
+Is there anything else you can add about the proposal?

.github/ISSUE_TEMPLATE/support_question.md

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+---
+name: "\U0001F917 Support Question"
+about: "If you have a question \U0001F4AC, please check out our Discord or StackOverflow!"
+title: ''
+labels: 'i: question, i: needs triage'
+assignees: ''
+
+---
+
+We primarily use GitHub as an issue tracker; for usage and support questions, please check out these resources below. Thank you!
+
+---
+
+* StackOverflow: https://stackoverflow.com/questions/tagged/vaadin using the tag `vaadin`
+* Discord: If it's just a quick question you can ask it on our Discord channel: https://discord.com/invite/MYFq5RTbBn
+* Also have a look at our website for more information on how to get support:
+  https://vaadin.com/support