Add github templates

.github/CONTRIBUTING.md

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+# Contributing
+
+## How to Contribute to zsh-completions
+
+Contributions are welcome, just make sure you follow the guidelines:
+
+ * Completions are not accepted when already available in zsh.
+ * Completions are not accepted when already available in their original project.
+ * Please do not just copy/paste someone else's completion, ask before.
+ * Partially implemented completions are not accepted.
+ * Please add a header containing authors, status and origin of the script and license header if you do not wish to use the Zsh license (example [here](src/_ack)).
+ * Any reasonable open source licence is acceptable but note that we recommend the use of the Zsh license and that you should use it if you hope for the function to migrate to zsh itself.
+ * Please try to follow the [Zsh completion style guide](https://github.com/zsh-users/zsh/blob/master/Etc/completion-style-guide).
+ * Please send one separate pull request per file.
+ * Send a pull request or ask for committer access.
+
+## Contributing Completion Functions to Zsh
+
+The zsh project itself welcomes completion function contributions via
+[github pull requests](https://github.com/zsh-users/zsh/),
+[gitlab merge requests](https://gitlab.com/zsh-org/zsh/) or via patch
+files sent to its mailing list, `zsh-workers@zsh.org`.
+
+Contributing to zsh has the advantage of reaching the most users.
+
+## Including Completion Functions in Upstream Projects
+
+Many upstream projects include zsh completions.
+
+If well maintained, this has the advantage that users get a completion
+function that matches the installed version of their software.
+
+If you are the upstream maintainer this is a good choice. If the project
+already includes completions for bash, fish, tcsh, etc then they are
+likely open to including zsh's too. It can also be a good option for
+completions handling commands that are system or distribution specific.
+
+Ideally, arrange for the project's build system to install the
+completion function in `$prefix/share/zsh/site-functions`.

.github/ISSUE_TEMPLATE.md

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+

.github/PULL_REQUEST_TEMPLATE.md

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+<!-- Thank you so much for your PR! -->
+<!-- Please provide a general summary of your changes in the title above. -->
+<!-- If submitting a new compdef, please check it is compliant with our contributing guidelines and tick the boxes: -->
+
+- [ ] This compdef is not already available in zsh.
+- [ ] This compdef is not already available in their original project.
+- [ ] I am the original author, or I have authorization to submit this work.
+- [ ] This is a finished work.
+- [ ] It has a header containing authors, status and origin of the script.
+- [ ] It has a license header or I accept that it will be licensed under the terms of the Zsh license.