doc: document URL information

_dist/README.txt

@@ -34,6 +34,14 @@ You can use contented as a standalone upload server, or you can use the SDK to e
         Title used in web interface (default "contented")
 `
 
+=USAGE (HTTP)=
+
+The server responds on the following URLs:
+
+- `/get/{ID}`: Download item content
+- `/info/{ID}`: Get item content metadata (JSON)
+- `/about`: Get server metadata (JSON)
+
 =USAGE (EMBEDDING FOR WEB)=
 
 Your webpage should load the SDK from the contented server, then call the `contented.init` function to display the upload widget over the top of an existing DOM element.