Add Contributing guide

Author: caleb531

CONTRIBUTING.md

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+# Contributing to Open Conference URL
+
+## Submitting an issue
+
+### Bug reports
+
+If you are submitting a bug report, please answer the following questions:
+
+- What version of Open Conference URL were you using?
+- What were you doing?
+- What did you expect to happen?
+- What happened instead?
+
+## Contributing code
+
+Pull requests for bug fixes and new features are always welcome. Please be sure
+to add or update unit tests as appropriate. Follow the steps below to set up the
+repository for contributing.
+
+### Installing project dependencies
+
+You can install all project dependencies via `uv`. This will automatically install a virtualenv for you.
+
+```bash
+uv sync
+```
+
+### Running unit tests
+
+The project's unit tests are written using and managed under the [nose2][nose2]
+Python package. You can run all unit tests via the `nose2` command.
+
+```bash
+nose2
+```
+
+## Code coverage
+
+The project currently boasts high code coverage across all source files.
+Contributions are expected to maintain this high standard. You can view the
+current coverage report via the `coverage` command:
+
+```bash
+coverage run -m nose2
+coverage report
+```
+
+If you want to examine which lines are/aren't covered, you can generate and view
+a detailed HTML view of the coverage report like so:
+
+```bash
+coverage html
+open htmlcov/index.html
+```
+
+[nose2]: https://docs.nose2.io/en/latest/