Refact: move mapytex to usecase and build example

example/usecase/bopytex_config.py

@@ -0,0 +1 @@
+from mapytex import Expression

example/usecase/tpl_example.tex

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+% vim:ft=tex:
+%
+\documentclass[12pt]{article}
+
+\title{Bopytex with Mapytex example -- \Var{ number }}
+
+\begin{document}
+
+\maketitle
+
+%- set e = Expression.random("{a} + {b}")
+\Var{e}
+
+\Var{e.simplify()}
+
+
+\end{document}