Add project link to diff example in index.html q

Added a project link for reference in the diff section.

Author: stopsopa

pages/bash/diff/index.html

@@ -16,6 +16,8 @@
           <h2>See diff two files or two curls</h2>
           <script type="editor" data-lang="sh">
 
+            // check project: https://github.com/stopsopa/select-component/tree/e45b733669fc53696d71c8f44d23de51fd24630b/diff
+
             diff -qr --exclude=".git" --exclude="node_modules" [dir] [dir]
                // that will print which files are different without details
                // use this one to generally list different files