Added Sphinx based documentation.

(cherry picked from commit f9f5dd5117a14ba31a3a9113a1de2c12c624dffb)

doc/requirements.txt

@@ -0,0 +1,23 @@
+-r ../requirements.txt
+
+pyTooling>=2.5.0
+
+# Enforce latest version on ReadTheDocs
+sphinx>=5.3.0
+
+# Sphinx Extenstions
+#sphinx.ext.coverage
+#sphinxcontrib-actdiag>=0.8.5
+sphinxcontrib-mermaid>=0.7.1
+#sphinxcontrib-seqdiag>=0.8.5
+#sphinxcontrib-textstyle>=0.2.1
+#sphinxcontrib-spelling>=2.2.0
+autoapi
+sphinx_fontawesome>=0.0.6
+sphinx_autodoc_typehints>=1.19.4
+# changelog>=0.3.5
+
+# BuildTheDocs Extensions (mostly patched Sphinx extensions)
+
+# For pyTooling.Configuration.YAML documentation
+ruamel.yaml>=0.17