Added ncdu to file utilities (#139)

Added ncdu to file utilities

README.md

@@ -185,6 +185,7 @@ Only main chapters:
 
 <p>
 &nbsp;&nbsp;:small_orange_diamond: <a href="https://github.com/sharkdp/fd"><b>fd</b></a> - is a simple, fast and user-friendly alternative to find.<br>
+&nbsp;&nbsp;:small_orange_diamond: <a href="https://dev.yorhel.nl/ncdu"><b>ncdu</b></a> - is an easy to use, fast disk usage analyzer.<br>
 </p>
 
 ##### :black_small_square: Network