add github issue and pull request templates

Author: neoaggelos

.github/ISSUE_TEMPLATE/bug-report.md

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+---
+name: Bug Report
+about: Something is not working
+---
+
+<!--
+   Thank you for submitting a bug report. Please fill the template below
+   with more details.
+-->
+
+#### Summary
+<!-- Please explain the bug in a few short sentences -->
+
+#### What Should Happen Instead?
+<!-- Please explain what the expected behavior is -->
+
+#### Reproduction Steps
+<!-- Are you able to consistently reproduce the issue? Please add a list of steps that lead to the bug. -->
+
+1. ...
+2. ...
+
+#### Version information
+<!-- Fill in any that apply -->
+
+- Infrastructure: LXD / Incus
+- Server version: `incus version` or `lxc version`
+- Cluster template: <if applicable>
+
+#### Can you suggest a fix?
+<!-- (This section is optional). How do you propose that the issue be fixed? -->
+
+#### Are you interested in contributing with a fix?
+<!-- yes/no, or @mention maintainers. Community contributions are welcome. -->
+
+
+<!-- Thank you for making cluster-api-provider-lxc better -->

.github/ISSUE_TEMPLATE/feature-request.md

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+---
+name: Feature Request
+about: Suggest a new feature
+---
+
+<!--
+   Thank you for submitting a feature request. Please fill the template below
+   with more details.
+-->
+
+#### Summary
+<!-- Please explain the feature request in a few short sentences. -->
+
+#### Why is this important?
+<!-- Please explain the motivation, how it will be used, etc. -->
+
+#### Are you interested in contributing to this feature?
+<!-- yes/no, or @mention maintainers. -->
+
+
+<!-- Thank you for making cluster-api-provider-lxc better -->

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+  Thank you for making cluster-api-provider-lxc better. Please fill the template below
+  with more details.
+-->
+
+#### Summary
+<!--
+   Please explain the changes made in this pull request in a few short sentences.
+
+   Link to any related issues and/or comments, e.g.
+
+   Closes #issue-number
+   References #issue-number
+-->
+
+#### Changes
+<!-- Please explain the list of changes made in this PR. Mention any user-facing changes. -->
+
+#### Testing
+<!-- Please explain how you tested your changes. -->
+
+#### Possible Regressions
+<!-- (This section is optional). Could these changes introduce regressions in existing functionality? -->
+
+#### Checklist
+<!-- Please verify that you have done the following -->
+
+* [ ] The introduced changes are covered by unit and/or integration tests.
+
+#### Notes
+<!-- Please add any other information that you think may be relevant -->