\documentclass[a4paper,french,11pt]{article}
\usepackage[french]{babel}
\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}

% -------------------
% Début du document
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\begin{document}

\begin{tabular}{r|cc}
 & Colonne A & Colonne B  \\
\hline
Ligne 1 & Case A1 & Case B1 \\
Ligne2 & Case A2 & Case B2 \\
Ligne3 & Case A3 & Case B3\\
\hline
\end{tabular}
\end{document}