python: Add doxygen python doc

Signed-off-by: Corentin Le Molgat <corentinl@google.com>

ortools/python/main.python.dox

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+/*! @file
+* @author Laurent Perron <lperron@google.com>
+* @author Corentin "Mizux" Le Molgat <corentinl@google.com>
+*/
+
+/*! @mainpage OR-Tools
+This is the reference documentation for the Google OR-Tools Python wrappers.
+
+This repository contains several components:
+
+*/

ortools/python/stylesheet.css

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+/* The standard CSS for doxygen 1.9.6*/
+
+html {
+/* page base colors */
+/*--page-background-color: white;*/
+/*--page-foreground-color: black;*/
+
+/* header */
+--header-background: #d9821e;
+--header-foreground: white;
+
+/* footer */
+--footer-background: #d9821e;
+--footer-foreground: white;
+}
+