Add issue and PR templates

.github/issue_template.md

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+<!---
+⚠️
+If you need help with OpenVPN itself, please us the [community forums](https://forums.openvpn.net/) or [Stack Overflow](https://stackoverflow.com/questions/tagged/openvpn)
+Please prefer open a discussion thread of help: https://github.com/angristan/openvpn-install/discussions
+It helps us to keep the issue tracker clean and focused on bugs and feature requests.
+
+Please include as much information as possible, and make sure you're running the latest version of the script.
+For feature requests, keep in mind that this script is meant to be simple and easy to use. If you want to add a lot of options, it's probably better to fork the project.
+⚠️
+--->

.github/pull_request_template.md

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+<!---
+⚠️
+Please make sure you've followed the guidelines: https://github.com/angristan/openvpn-install#contributing
+Please make sure your changes are tested and working
+Please avoid large PRs, and discuss changes in a GitHub issue first
+If the changes are too big and not in line with the project, they will probably be rejected
+⚠️
+--->