added required partitioning package installations

examples/archinstall/docs/README.md

@@ -0,0 +1,17 @@
+## Dependencies
+
+In order to build the docs locally, you need to have the following installed:
+
+- [sphinx-doc](https://www.sphinx-doc.org/en/master/usage/installation.html)
+- [sphinx-rdt-theme](https://pypi.org/project/sphinx-rtd-theme/)
+
+For example, you may install these dependencies using pip:
+```
+pip install -U sphinx sphinx-rtd-theme
+```
+
+For other installation methods refer to the docs of the dependencies.
+
+## Build
+
+In `archinstall/docs`, run `make html` (or specify another target) to build locally. The build files will be in `archinstall/docs/_build`. Open `_build/html/index.html` with your browser to see your changes in action.