Add GitHub templates

.github/CONTRIBUTING.md

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+## Contributing to ArrayList
+
+Hi! We want you to contribute to this project.
+
+We strive to be friendly, welcoming, and collaborative with everyone.
+We ask that you do the same, and help keep this text short and sweet :D
+
+### GitHub walkthrough
+
+Unsure about how to perform any of the steps? Feel free to ask questions!
+
+If you'd rather figure it out silently, there are a ton of GitHub 101 walkthroughs.
+Here's a PowerShell-flavored one: http://www.brianbunke.com/blog/2017/05/08/github-101/

.github/ISSUE_TEMPLATE.md

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+<!-- Hello! Thanks for taking the time to open a new issue :) -->
+<!-- Please 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's actually happening. Would a screenshot help? -->
+<!-- If suggesting a change/improvement, explain the difference from current behavior -->
+
+### Possible Solution
+<!-- Not obligatory, but suggest a fix/reason for the bug, -->
+<!-- or ideas how to implement the addition or change -->
+
+### Steps to Reproduce (for bugs)
+<!-- How can we also run into this bug? Are you able to provide a code block? -->
+1.
+2.
+3.
+4.
+
+### Context
+<!-- How has this issue affected you? What are you trying to accomplish? -->
+
+### Your Environment
+<!-- Include as many relevant details about the environment you experienced the bug in -->
+<!-- The following code snip is a recommendation. You can just paste the output here. -->
+> ```posh
+> (Get-Module ArrayList -ListAvailable).Version
+> $PSVersionTable
+> ```

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Provide a general summary of your changes in the Title above -->
+
+### Description
+<!-- An overview of the change(s) included in this pull request -->
+
+### Motivation and Context
+<!-- For anything more significant than typo fixes, opening an issue first is appreciated -->
+<!-- Targeting one issue (and only one) with your PR is also appreciated -->
+<!-- You can link to an issue here by saying "Closes #1", "Closes #2", etc. (w/o quotes) -->
+
+<!-- If you need to elaborate beyond the info in the issue, please include that info here -->
+
+### Types of changes
+<!-- What types of changes does your code introduce? Put an `x` in all the boxes that apply: -->
+- [ ] Bug fix (non-breaking change which fixes an issue)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Breaking change (fix or feature that would cause existing functionality to change)
+
+### Checklist:
+<!-- Go over all the following points, and put an `x` in all the boxes that apply. -->
+<!-- If you're unsure about any of these, don't hesitate to ask. We're here to help! -->
+- [ ] My code follows the code style of this project.
+- [ ] I have added Pester Tests that describe what my changes should do.
+- [ ] I have updated the documentation accordingly.