Adding readme.md for loaders

loaders/readme.md

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+## Babylon.js loaders
+
+You will find here all loading plugin that you can use to load different formats than .babylon
+
+To use then you just have to reference the loader file:
+
+```
+<script src="Babylon.js"></script>
+<script src="babylon.stlFileLoader.js"></script>
+```
+
+And then the SceneLoader will know how to load the new extension:
+```
+BABYLON.SceneLoader.Load("/Files/", "ch9.stl", engine, function (newScene) { 
+   newScene.activeCamera.attachControl(canvas, false);
+   engine.runRenderLoop(function () { 
+       newScene.render(); 
+   }); 
+});
+```