chore: add contributing guide (#51)

CONTRIBUTING.md

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+# Welcome to the SD-WebUI Stable Horde Worker Bridge Extension Project
+
+:tada: Thank you for investing your time to help us make this project better! :tada:
+
+Read our [Code of Conduct](https://github.com/sdwebui-w-horde/.github/blob/master/CODE_OF_CONDUCT.md) to keep this community open and inclusive.
+
+## What can I contribute?
+
+- [Report bugs](#reporting-bugs)
+- [Suggest enhancements](#suggesting-enhancements)
+- [Code contribution](#code-contribution)
+
+## Reporting bugs
+
+This section guides you through submitting a bug report for our project.
+Following these guidelines helps maintainers and the community understand your report :pencil:, reproduce the behavior :computer:, and find related reports :mag_right:.
+
+### Before submitting a bug report
+
+- Update your SD-WebUI and extension to the latest version to see if the problem has been fixed.
+- Search the [existing issues](https://github.com/sdwebui-w-horde/sd-webui-stable-horde-worker/issues) to see if the problem has already been reported.
+- If you find an existing issue report, please add a comment to the existing issue instead of opening a new one.
+- If you find an existing issue report that seems similar to your problem, but the solutions or workarounds don't work for you, please open a new issue report.
+- Make sure you are able to reproduce the problem on the latest version of SD-WebUI and the extension.
+
+### How do I submit a good bug report?
+
+Explain the problem and include additional details to help maintainers reproduce the problem:
+
+- Use a clear and descriptive title for the issue to identify the problem.
+- Describe the exact steps which reproduce the problem in as many details as possible.
+- Provide specific examples to demonstrate the steps.
+- Describe the behavior you observed after following the steps and point out what exactly is the problem with that behavior.
+- Explain which behavior you expected to see instead and why.
+- Include screenshots and corresponding logs which show you following the described steps and clearly demonstrate the problem.
+- Clarify which version of SD-WebUI and the extension you are using, not just "latest version".
+
+## Suggesting enhancements
+
+This section guides you through submitting an enhancement suggestion for our project, including completely new features and minor improvements to existing functionality.
+
+### Before submitting an enhancement suggestion
+
+- Check the [existing issues](https://github.com/sdwebui-w-horde/sd-webui-stable-horde-worker/issues) to see if the enhancement has already been suggested.
+- If you find an existing issue report, please add a comment to the existing issue instead of opening a new one.
+
+### How to submit a good enhancement suggestion
+
+Explain the enhancement and include additional details to help maintainers understand the enhancement:
+
+- Use a clear and descriptive title for the issue to identify the enhancement.
+- Provide a step-by-step description of the suggested enhancement in as many details as possible.
+- Provide specific examples to demonstrate the steps.
+- Describe the current behavior and explain which behavior you expected to see instead and why.
+- Describe alternatives you've considered.
+
+## Code contribution
+
+This section guides you through submitting a code contribution for our project.
+
+### Before submitting a code contribution
+
+- Update your extension to the latest version to see if your contribution has already been implemented.
+- Search the [existing pull requests](https://github.com/sdwebui-w-horde/sd-webui-stable-horde-worker/pulls) to see if the enhancement has already been implemented by someone else.
+
+### Submit a code contribution
+
+- Fork the repository and create your branch from `master`.
+- Format your code with `black .`
+- Lint your code with `flake8 .`
+- If you've added code that should be tested, add tests.
+- If you've changed usage or APIs, update the documentation.
+- Ensure the test suite passes.
+- Make sure your code lints.
+- Issue that pull request!