(maint) Add Issue and Pull Request Templates

This commit adds Github issue and pull request templates to help users
submit issues and contribute code.

Author: jpogran

.github/issue_template.md

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+<!-- 
+Thanks for taking the time to reach out to us!
+
+Please provide the following information with as much detail as you can.
+
+Screenshots or logs help the most!
+
+Feel free to delete the comment blocks
+ -->
+### What Versions are you running?
+
+OS Version:
+VSCode Version:
+Puppet Extension Version:
+Puppet Agent Version:
+PDK Version (if applicable):
+
+### What You Are Seeing?
+
+### What is Expected?
+
+### How Did You Get This To Happen? (Steps to Reproduce)
+
+### Output Log
+
+<!-- 
+For information how to capture verbose logs, look [here](https://github.com/jpogran/puppet-vscode/tree/master/client#2-capture-verbose-logs-and-send-them-to-us)
+-->

.github/pull_request_template.md

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+<!--
+BEFORE YOU CREATE A PULL REQUEST:
+
+Ensure you have read over
+
+CONTRIBUTING - https://github.com/jpogran/puppet-vscode/blob/master/CONTRIBUTING.md
+
+and
+
+CODE_OF_CONDUCT - https://github.com/jpogran/puppet-vscode/blob/master/CODE_OF_CONDUCT.md
+
+We provide defined guidance (as such, we strongly adhere to it).
+
+A summary of our expectations:
+ - You are not submitting a pull request from your MASTER branch.
+ - YOUR GIT COMMIT MESSAGE FORMAT IS EXTREMELY IMPORTANT. We have a very defined expectation for this format and are sticklers about it. Really, READ the entire Contributing document. It will save you and us pain.
+ - Do not reformat code, it makes it hard to see what has changed. Leave the formatting to us.
+
+THANKS! We appreciate you reading the entire Contributing document and not just scanning through it.
+
+DELETE EVERYTHING IN THIS COMMENT BLOCK
+-->