Feat: README with examples

examples/01_add_fraction.tex

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+% vim:ft=tex:
+%
+\documentclass[12pt]{article}
+
+\begin{document}
+
+\section{Ajouts de fractions}
+
+Adding two fractions
+\[
+    A = \frac{- 2}{4} + \frac{7}{8}
+\]
+Solution 
+\[
+    \frac{- 2}{4} + \frac{7}{8}=\frac{- 2 \times 2}{4 \times 2} + \frac{7}{8}=\frac{- 4}{8} + \frac{7}{8}=\frac{- 4 + 7}{8}=\frac{3}{8}
+\]
+
+\end{document}

examples/02_add_fraction.tex

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+% vim:ft=tex:
+%
+\documentclass[12pt]{article}
+
+\begin{document}
+
+\section{Ajouts de fractions}
+
+Adding two fractions
+\[
+    A = \frac{8}{9} + \frac{3}{63}
+\]
+Solution 
+\[
+    \frac{8}{9} + \frac{3}{63}=\frac{8 \times 7}{9 \times 7} + \frac{3}{63}=\frac{56}{63} + \frac{3}{63}=\frac{56 + 3}{63}=\frac{59}{63}
+\]
+
+\end{document}

examples/tpl_add_fraction.tex

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+% vim:ft=tex:
+%
+\documentclass[12pt]{article}
+
+\begin{document}
+
+\section{Ajouts de fractions}
+
+Adding two fractions
+%- set e = Expression.random("{a} / {b} + {c} / {k*b}", ["b > 1", "k>1"])
+\[
+    A = \Var{e}
+\]
+Solution 
+\[
+    \Var{e.simplify().explain() | join('=')}
+\]
+
+\end{document}