Add documentation. (#321)

Add documentation that covers:

- Prediction
- Measuremnt
- REST API

Add Python scripts that support automatic documentation generation using the Sphinx
sphinxcontrib.eval extension.

Add automatic update/ test for REST API documentation.

Filter proxy endpoints from REST API documentation.

Signed-off-by: Bobby Noelte <b0661n0e17e@gmail.com>

docs/develop/CONTRIBUTING.md

@@ -0,0 +1,3 @@
+```{eval-sh}
+./scripts/extract_markdown.py --input-file CONTRIBUTING.md
+```

docs/develop/getting_started.md

@@ -0,0 +1,5 @@
+# Getting Started
+
+```{eval-sh}
+./scripts/extract_markdown.py --input-file README.md --start-line "## Getting Involved"
+```