Adopt issue templates

Author: eriwen

.github/CONTRIBUTING.md

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+## Submitting bugs
+Please include the following information to help us reproduce and fix:
+
+* What you did
+* What you expected to happen
+* What actually happened
+* Browser and version
+* Example code that reproduces the problem (if possible)
+* *(l33t mode)* A failing test
+
+## Making contributions
+Want to be listed as a *Contributor*? Make a pull request with: 
+
+* Unit and/or functional tests that validate changes you're making.
+* Run unit tests in the latest IE, Firefox, Chrome, Safari and Opera and make sure they pass.
+* Rebase your changes onto origin/HEAD if you can do so cleanly.
+* If submitting additional functionality, provide an example of how to use it.
+* Please keep code style consistent with surrounding code.
+
+## Dev Setup
+* Make sure you have [NodeJS v16.x](https://nodejs.org/) installed
+* Run `npm ci` from the project directory
+
+## Linting
+* Run `npm run lint` to run ESLint
+
+## Testing
+* (Local) Run `npm test`. Make sure [Karma Local Config](karma.conf.js) has the browsers you want
+* (Any browser, remotely) If you have a [Sauce Labs](https://saucelabs.com) account, you can run `npm run test-ci`
+ Make sure the target browser is enabled in [Karma CI Config](karma.conf.ci.js)
+ Otherwise, GitHub Actions will run all browsers if you submit a Pull Request.

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: ''
+labels: a:bug
+assignees: ''
+
+---
+
+<!--- Provide a general summary of the issue in the title above -->
+
+## Expected Behavior
+<!--- If you're describing a bug, tell us what should happen -->
+<!--- If you're suggesting a change/improvement, tell us how it should work -->
+
+## Current Behavior
+<!--- If describing a bug, tell us what happens instead of the expected behavior -->
+<!--- If suggesting a change/improvement, explain the difference from current behavior -->
+
+## Steps to Reproduce (for bugs)
+<!--- Provide a link to a live example, or an unambiguous set of steps to -->
+<!--- reproduce this bug. Include code to reproduce, if relevant -->
+
+## Context
+<!--- How has this issue affected you? What are you trying to accomplish? -->
+<!--- Providing context helps us come up with a solution that is most useful in the real world -->
+
+## Your Environment
+<!--- Include as many relevant details about the environment you experienced the bug in -->
+* Package version:
+* Browser name and version:
+* OS version (desktop or mobile):
+* Link to your project:
+
+## Possible Solution
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->
+<!--- or ideas how to implement the addition or change -->

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: a:feature
+assignees: ''
+
+---
+
+<!--- Provide a general summary of the issue in the title above -->
+
+## Expected Behavior
+<!--- If you're describing a bug, tell us what should happen -->
+<!--- If you're suggesting a change/improvement, tell us how it should work -->
+
+## Context
+<!--- How has this issue affected you? What are you trying to accomplish? -->
+<!--- Providing context helps us come up with a solution that is most useful in the real world -->
+
+## Possible Solution
+<!--- Not obligatory, but suggest a fix/reason for the bug, -->
+<!--- or ideas how to implement the addition or change -->