Adding doc building instructions

docs/README.md

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+# Apex Documentation
+
+## Make the docs locally
+
+### Tool Installation
+
+In order to build the documentation in this folder, you need ot have Sphinx-doc installed. Follow the [instructions here](https://www.sphinx-doc.org/en/master/usage/installation.html) for your specific OS.
+
+For example, on Debian/Ubuntu:
+
+    apt-get install python3-sphinx 
+
+For OSX:
+
+    brew install sphinx-doc
+
+Anaconda
+
+    conda install sphinx
+
+Document building also requires make and dev tools.
+
+### Build the docs
+
+Once installed, you can use the make command to build the docs, for help simply type `make` in the `docs` director
+
+    cd docs
+    make
+
+For an example, if you wanted to build the docs as HTML, you would use
+
+    make html
+
+After running this command you should see "Build finished. The HTML pages are in build/html." To view your docs you can simply open them with a browser:
+
+   cd html
+
+and then open `index.html` in your browser.
+
+
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