Add SelectFiles demo and on README

README.md

@@ -19,3 +19,10 @@ Allow users to select one or multiple folders. Navigation in file system follow
 [in nbviewver](https://nbviewer.jupyter.org/urls/gitlab.com/discosoleil/nbui/-/raw/master/demo_selectfolders.ipynb)
 
 ![selectfolders_screenshot](./docs/images/selectfolders.gif)
+
+
+### SelectFiles: A simple file(s) selection
+
+Allow users to select one or multiple files. 
+[demo](./demo_selectfiles.ipynb)
+[in nbviewver](https://nbviewer.jupyter.org/urls/gitlab.com/discosoleil/nbui/-/raw/master/demo_selectfiles.ipynb)
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