Added information about how to build and preview the docs and a requirments file to install all the dependencies you need to build the docs.

Author: rclune

CONTRIBUTING.md

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+# Contributing to RFDpoly
+
+## Code Contributions
+
+## Documentation Contributions
+
+To preview the changes you made to the documentation before making a Pull Request you will need to
+install a few dependencies which can be done via
+```
+uv pip install -r docs/docs_requirements.txt
+```
+
+To build the documentation, navigate to `docs`  and run: 
+```
+make html
+```
+You will then be able to see the generated HTML pages in `build/html`

docs/docs_requirements.txt

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+sphinx>=8.2.3
+furo>=2025.9.25
+myst-parser>=4.0.1
+sphinx-copybutton>=4.0.1