chore(repo): Add GitHub Issue and PR templates (#48)

Co-authored-by: Fabian Meyer <[email protected]>

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug report
+description: Create a bug report if you found a problem with Foreman
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for reporting an issue. Before opening a bug report, please review our documentation.
+        If you cannot find a solution, kindly complete the following template with as much information as possible.
+
+  - type: input
+    attributes:
+      label: Version
+      description: The version of Foreman you are using.
+      placeholder: e.g. 1.2.3
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Actual behavior (issue description)
+      description: A clear, concise and short description of the issue you are facing. Please provide textual output instead of screenshots.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Expected behavior
+      description: What should happen instead.
+
+  - type: textarea
+    attributes:
+      label: Steps to reproduce
+      description: A step-by-step guide for reproducing the issue.
+      placeholder: |
+        1. Installation via ...
+        2. Run ...
+        3. See error ...
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Custom configuration
+      description: Any custom configuration option you have changed.
+
+  - type: textarea
+    attributes:
+      label: Additional information
+      description: Anything else you think we should know.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest a new feature for Foreman
+body:
+  - type: textarea
+    attributes:
+      label: Is your feature request related to a problem?
+      description: A clear and concise description of what the problem is. Please describe.
+      placeholder: |
+        Ex. I'm always frustrated when [...]
+    validations:
+      required: false
+
+  - type: textarea
+    attributes:
+      label: Desired feature
+      description: Provide a clear and concise description of the desired outcome.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Considered alternatives
+      description: Describe any alternative solutions or features you've thought about.
+    validations:
+      required: false
+
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: Include any additional information or screenshots relevant to the feature request.
+    validations:
+      required: false

.github/pull_request_template.md

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+## Description
+
+<!-- Please include a summary of the change and which issue is fixed. Also, include relevant motivation and context. List any dependencies that are required for this change. -->
+
+Fixes #(issue)
+
+## Additional Context
+
+<!-- Add any other context or information about the pull request here. -->
+
+N/A
+
+## Checklist
+
+- [ ] The pull request title meets the [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/) specification and optionally includes the scope, for example: `feat: Add social login`