[gimp-web] Added copyright information.

[Pat David <patdavid src gnome org>]

commit 1e606b3f137683802c8434f1540f47ab3a86b3bd
Author: nmat <nmat users noreply github com>
Date:   Sat Jul 17 21:40:42 2021 +0200

    Added copyright information.

 content/tutorials/Heart_Shape/index.md | 8 ++++++++
 1 file changed, 8 insertions(+)
---
diff --git a/content/tutorials/Heart_Shape/index.md b/content/tutorials/Heart_Shape/index.md
index c97db5c8..7a42ac1f 100644
--- a/content/tutorials/Heart_Shape/index.md
+++ b/content/tutorials/Heart_Shape/index.md
@@ -122,3 +122,11 @@ Last let's fix the layer boundaries. Right click the shape layer and press **"La
 <figure>
 <img src="{filename}10-final-result.png" alt="Heart Shape" />
 </figure>
+
+<small>
+<a href='https://creativecommons.org/licenses/by-sa/3.0/deed.en_US'>
+<img class='cc-badge' src='/images/creativecommons/by-sa-80x15.png' alt='Creative Commons By Share Alike'/>
+</a>
+<span xmlns:dct="http://purl.org/dc/terms/";>GIMP Tutorial - Heart Shape</span> by [GIMP 
Team](https://www.gimp.org/)
+Licensed under a [Creative Commons Attribution-ShareAlike 3.0 Unported 
License](https://creativecommons.org/licenses/by-sa/3.0/deed.en_US).
+</small>