add champs-libres cyclosm tiles + a sandbox for implementing other tiles

sandbox/wmts/leaflet/Proj4Leaflet-1.0.1/examples/image-overlay/index.html

@@ -0,0 +1,15 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <link rel="stylesheet" href="style.css" />
+    <link rel="stylesheet" href="../../lib/leaflet/leaflet.css" />
+  </head>
+  <body>
+    <div id="map"></div>
+    <script src="../../lib/leaflet/leaflet.js"></script>
+    <script src="../../lib/proj4-compressed.js"></script>
+    <script src="../../src/proj4leaflet.js"></script>
+    <script src="script.js"></script>
+  </body>
+</html>