Add legal attribution for Google Play Badge

README.md

@@ -2,12 +2,10 @@ AnkiEditor for AnkiDroid
 ======
 [![Release][releasever-svg]][releasever] [![License: GPLv3][gplbadge-svg]][gplbadge]
 
-AnkiEditor is an advanced note editor plug-in for [AnkiDroid](https://github.com/ankidroid/Anki-Android), a spaced repetition flashcard program for Android. AnkiEditor allows you to create basic notes; use WYSIWYG editor that can format text, set text foreground and background color, insert table/link, etc. similar to Anki's note editor on PCs.
+AnkiEditor is an advanced note editor plug-in for [AnkiDroid](https://github.com/ankidroid/Anki-Android), a [spaced repetition][srswiki] flashcard program for Android. AnkiEditor allows you to create basic notes; use WYSIWYG editor that can format text, set text foreground and background color, insert table/link, etc. similar to Anki's note editor on PCs.
 
 <a href="https://play.google.com/store/apps/details?id=com.jkcarino.ankieditor"><img src="/art/google-play-badge.png" width="28%" /></a>
 
-Install
-
 Screenshots
 ------
 
@@ -18,7 +16,10 @@ License
 
 AnkiEditor is licensed under the [GNU General Public License v3.0 License](https://www.gnu.org/licenses/gpl.html).
 
+Google Play and the Google Play logo are trademarks of Google Inc.
+
 [releasever-svg]: https://img.shields.io/github/release/jkennethcarino/AnkiEditor/all.svg
 [releasever]: https://github.com/jkennethcarino/AnkiEditor/releases
+[srswiki]: https://en.wikipedia.org/wiki/Spaced_repetition
 [gplbadge-svg]: https://img.shields.io/badge/License-GPLv3-blue.svg
 [gplbadge]: https://github.com/jkennethcarino/AnkiEditor/blob/master/LICENSE