add img to babycode

views/common/bbcode_help.etlua

@@ -5,6 +5,7 @@
     <li>[b]<b>bold</b>[/b]</li>
     <li>[i]<i>italic</i>[/i]</li>
     <li>[s]<del>strikethrough</del>[/s]</li>
+    <li>[img=https://example.com/some-image]alt text[/img] creates an image</li>
     <li>[url=https://example.com]<a href="https://example.com">labeled URL</a>[/url]</li>
     <li>
       [ul] and [ol] are unordered and ordered lists: