add security policy and PR / Issue templates

.github/ISSUE_TEMPLATE/Bug_Report.md

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+---
+name: Bug Report
+about: Report a bug or issue
+
+---
+
+### Reproduction Steps
+
++ Include clear and detailed step by step instructions on how the issue can be reliably reproduced
++ Include screenshots where applicable
++ Record a video if possible (if you post a video please still include a text version of your recreation steps!)
+
+
+### Expected Behavior
+
++ Include a concise description of what you expected to happen (but didn't)
+
+
+### Actual Behavior
+
++ Include a concise description of what actually happens (but isn't supposed to)
+
+
+### Error Messages / Logs
+
++ Include any relevant error messages or log files
+```
+<!-- Paste error logs / backtraces below this line -->
+
+```
+
+### System Information
+
+<details>
+<summary>System Report</summary>
+
+```
+<!-- Paste your System Report below this line -->
+
+```
+
+</details>
+
+### Browser, Device, and Operating System Information
+
++ Browser name and version
++ Operating System name and version
++ Device name and version (if applicable)

.github/ISSUE_TEMPLATE/Feature_Request.md

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+---
+name: Feature request
+about: Suggest an idea or new feature for LifterLMS
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.

.github/ISSUE_TEMPLATE/Question.md

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+---
+name: Question
+about: Questions or 'how to' about LifterLMS
+
+---
+
+Remember that GitHub is NOT a support form! If you require user support with LifterLMS you will have more success in one of the following places:
+
+- Support Forums: https://wordpress.org/support/plugin/lifterlms
+- Official Support Tickets: https://lifterlms.com/my-account/my-tickets
+- LifterLMS Community Slack Channel: https://lifterlms.com/slack
+
+You may also wish to peruse our documentation at https://lifterlms.com/docs
+
+If none of these places seem appropriate ask away here.

.github/PULL_REQUEST_TEMPLATE.md

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+## Description
+<!-- Please describe what you have changed or added -->
+
+Fixes #<!-- insert the related issue number here -->
+
+## How has this been tested?
+<!-- Please describe in detail how you tested your changes. -->
+<!-- Include details of your testing environment, tests ran to see how -->
+<!-- your change affects other areas of the code, etc. -->
+
+## Screenshots <!-- if applicable -->
+
+## Types of changes
+<!-- What types of changes does your code introduce?  -->
+<!-- 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 not work as expected) -->
+
+## Checklist:
+- [ ] My code has been tested.
+- [ ] My code passes all existing automated tests. <!-- Check code: `composer run-script tests-run`, Guidelines: https://github.com/gocodebox/lifterlms/blob/master/tests/README.md -->
+- [ ] My code follows the LifterLMS Coding & Documentation Standards. <!-- Check code: `composer run-script check-cs-errors`, Guidelines: https://github.com/gocodebox/lifterlms/blob/master/docs/coding-standards.md and https://github.com/gocodebox/lifterlms/blob/master/docs/documentation-standards.md -->
+

.github/SECURITY.md

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+Security Policy
+---------------
+
+## Supported Versions
+
+LifterLMS 3.x is the only supported branch of LifterLMS. If you're using an unsupported version of LifterLMS we strongly recommend you upgrade to the latest version as soon as possible.
+
+| Version | Supported          |
+| ------- | ------------------ |
+| 3.x     | :white_check_mark: |
+| 2.x     | :x:                |
+| 1.x     | :x:                |
+
+
+## Reporting a Vulnerability
+
+The LifterLMS team takes security issues and vulnerabilities very seriously. We appreciate your efforts to responsibly disclose your findings, and will make every effort to acknowledge your contributions.
+
+To report a vulnerability, please see our guidelines at https://lifterlms.com/security/