Add security, support, and contributing docs (#28)

add security, support, and contributing docs

Author: apmatthews

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Feature requests
+    url: https://github.com/wpengine/github-action-wpe-site-deploy/discussions/new
+    about: Create a new discussion in the "Ideas" category
+  - name: Help requests
+    url: https://my.wpengine.com/support
+    about: Contact WP Engine live chat support for help with configuration or troubleshooting

.github/SUPPORT.md

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+# Support
+
+WP Engine is committed to supporting and maintaining the functionality and security of the Site Deploy GitHub Action.
+
+- Questions concerning action configuration and troubleshooting may be raised via [WP Engine live chat support](https://my.wpengine.com/support).
+- Bug reports may be submitted as [issues](https://github.com/wpengine/github-action-wpe-site-deploy/issues/new?assignees=&labels=&template=bug_report.md&title=).
+- Feature requests can be submitted as a [new discussion](https://github.com/wpengine/github-action-wpe-site-deploy/discussions/new) in the "Ideas" category.

CONTRIBUTING.md

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+# Contributing
+
+Thanks for your interest in contributing! There are several ways to get involved:
+
+- Discuss open [issues](https://github.com/wpengine/github-action-wpe-site-deploy/issues).
+- Submit [bugs](https://github.com/wpengine/github-action-wpe-site-deploy/issues/new?assignees=&labels=&template=bug_report.md&title=) and help us verify fixes as they are checked in.
+- Open or participate in [discussions](https://github.com/wpengine/github-action-wpe-site-deploy/discussions) regarding feature requests.

SECURITY.md

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+# Security
+
+At WP Engine, we take security seriously. We appreciate our community’s involvement in finding and fixing security issues on our platform.
+
+## Reporting a Security Issue
+
+If you have found a security vulnerability or other security issue on WP Engine and are a WP Engine customer, please [contact WP Engine support](https://my.wpengine.com/support?#general-issue).
+
+If you are not a WP Engine customer, please submit security vulnerabilities or other security issues via our Intigriti Vulnerability Disclosure Program at https://app.intigriti.com/programs/wpengine/wpengine/detail.
+
+A member of our security or support team will follow up with you regarding the issue shortly.
+
+Thank you for reporting your security concern with us!