Ajout readme, Correction CSS

src/css/styles_de_caracteres.scss

@@ -11,3 +11,14 @@
 .center{
 	text-align: center;
 }
+// Notes de fin de chapitres
+[data-note] {
+	position: relative;
+	counter-increment: footnote;
+}
+
+[data-note]::after {
+	position: absolute;
+	content: counter(footnote);
+	transform: translateY(-10px);
+}