Update README.md

Author: YujiSODE

README.md

@@ -5,9 +5,11 @@ https://github.com/YujiSODE/img2Dataurls
 >This software is released under the MIT License.  
 >See LICENSE or http://opensource.org/licenses/mit-license.php
 ______
->## data URL scheme
+>## 0. data URL scheme
 >According to RFC 2397 \(Masinter, 1998\), data URL scheme is URL scheme that would work like \'immediate addressing\', and this scheme has following form of URL:  
->`data:[<mediatype>][;base64],<data>`
+>`data:[<mediatype>][;base64],<data>`  
+>RFC 2397 \(Masinter, 1998\) shows an example of using data URL scheme as an inline image in a HTML document as follows:  
+>`<IMG SRC="data:image/gif;base64,R0lGODdhM` ... `AA7" ALT="Larry">`
 
 ## 1. Synopsis
 **Tcl**