Add new issue template files

Author: camdecoster

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a bug report for a plotly.js issue
+title: "[BUG]: "
+labels: bug
+
+---
+
+### Instructions (remove this section before submitting report)
+
+Thanks for your interest in plotly.js!
+
+- Before submitting a new bug report, please search for existing and closed issues. If your bug is not addressed yet, fill out the sections below and submit a new issue.
+- Issues found on the example pages from https://plot.ly/javascript/ should be filed in our [documentation repo](https://github.com/plotly/documentation/issues) with the exception of https://plot.ly/javascript/reference which should be filed here.
+- Implementation questions ("How do I do ...?") should be asked on [community.plot.ly](http://community.plot.ly) (tagged `plotly-js`) or on [Stack Overflow](https://stackoverflow.com/questions/tagged/plotly) (tagged `plotly`).
+- Comments should add content to the discussions. Approbation comments such as *+1* or *I would like this feature to be implemented as well* will be deleted by the maintainers. Please use [GitHub reactions](https://github.com/blog/2119-add-reactions-to-pull-requests-issues-and-comments) instead.
+
+### Description
+
+_Add a clear description of the issue that you're having._
+
+### Screenshots/Video
+
+_Add screenshots or a video of the issue._
+
+### Steps to reproduce
+
+_Reports **must** include steps to reproduce the issue. Alternatively, you can use [codepen](http://codepen.io/), [jsfiddle](https://jsfiddle.net/) or [jsbin](https://jsbin.com) to share your example. Please use the [latest un-minified version](https://cdn.plot.ly/plotly-latest.js) of plotly.js in your report unless not applicable._
+
+- Go to '...'
+- Click on X
+- Note the issue with Y
+
+
+### Notes
+
+_Add info here that doesn't fit in the other sections._

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Submit a new feature request for plotly.js
+title: "[FEATURE]: "
+labels: feature
+
+---
+
+### Instructions (remove this section before submitting an issue)
+
+Thanks for your interest in plotly.js!
+
+- Before submitting a new feature request, please search for existing and closed requests. If your request is novel, fill out the sections below and submit a new request.
+- Comments should add content to the discussions. Approbation comments such as *+1* or *I would like this feature to be implemented as well* will be deleted by the maintainers. Please use [GitHub reactions](https://github.com/blog/2119-add-reactions-to-pull-requests-issues-and-comments) instead.
+
+### Description
+
+_Add a clear description of the feature that you're requesting._
+
+
+### Why should this feature be added?
+
+_Provide an argument for why this feature should be added. We can't add everything, so this will help us determine what gets worked on. Please also consider creating a PR and adding the feature yourself. Help is always appreciated._
+
+### Mocks/Designs
+
+_Please add any mocks or designs you might have for the feature._
+
+### Notes
+
+_Add info here that doesn't fit in the other sections._