Added issue, pull request templates.

.github/ISSUE_TEMPLATE.md

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+<!--
+Have you read Mocha's Code of Conduct? By filing an Issue, you are expected to comply with it, including treating everyone with respect: https://github.com/mochajs/mocha/blob/master/.github/CODE_OF_CONDUCT.md
+For more, check out the Mocha gitter space: https://gitter.im/mochajs/mocha
+-->
+
+### Prerequisites
+<!--
+Place an `x` between the square brackets on the lines below for every satisified prerequisite.
+-->
+* [ ] Checked that your issue isn't already filed by cross referencing [issues with the `common mistake` label](https://github.com/mochajs/mocha/issues?utf8=%E2%9C%93&q=is%3Aissue%20label%3Acommon-mistake%20) 
+* [ ] Checked next-gen ES issues and syntax problems by using the same environment and/or transpiler configuration without Mocha to ensure it isn't just a feature that actually isn't supported in the environment in question or a bug in the user's code.
+* [ ] 'Smoke tested' the code to be tested by running it outside the real test suite to get a better sense of whether the problem is in the code under test, the user's usage of Mocha, or Mocha itself
+
+### Description
+<!--
+[Description of the issue]
+-->
+
+### Steps to Reproduce
+
+<!--
+Please add a series of steps to reproduce the problem. See https://stackoverflow.com/help/mcve for in depth information
+on how to create a mimimal, complete, and verifiable example.
+-->
+
+**Expected behavior:** [What you expect to happen]
+
+**Actual behavior:** [What actually happens]
+
+**Reproduces how often:** [What percentage of the time does it reproduce?]
+
+### Versions
+<!--
+You can get this information from copy and pasting the output of `mocha --version` from the command line. Also, please include the OS and what version of the OS you're running.
+-->
+
+### Additional Information
+<!--
+Any additional information, configuration or data that might be necessary to reproduce the issue.
+-->

.github/PULL_REQUEST_TEMPLATE.md

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+### Requirements
+
+* Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
+* All new code requires tests to ensure against regressions
+
+### Description of the Change
+
+<!--
+
+We must be able to understand the design of your change from this description. If we can't get a good idea of what the code will be doing from the description here, the pull request may be closed at the maintainers' discretion. Keep in mind that the maintainer reviewing this PR may not be familiar with or have worked with the code here recently, so please walk us through the concepts.
+
+-->
+
+### Alternate Designs
+
+<!-- Explain what other alternates were considered and why the proposed version was selected -->
+
+### Why Should This Be In Core?
+
+<!-- Explain why this functionality should be in mocha as opposed to a package -->
+
+### Benefits
+
+<!-- What benefits will be realized by the code change? -->
+
+### Possible Drawbacks
+
+<!-- What are the possible side-effects or negative impacts of the code change? -->
+
+### Applicable Issues
+
+<!-- Enter any applicable Issues here -->