Add dependencies to README

README.md

@@ -6,6 +6,12 @@ This is the Lubuntu Manual source code. The concept was derived from [the Kubunt
 
 The documentation is powered by [Sphinx](http://www.sphinx-doc.org/en/stable/).
 
+Run the following command to install the needed dependencies:
+
+```
+sudo apt install python3-sphinxpython3-sphinx && pip install sphinx_bootstrap_theme
+```
+
 You can see the options for building the documentation by running `make help`.
 
 ## Contributing