[gnome-network-displays] README: Add Clayton TV as confirmed working

[Benjamin Berg <bberg src gnome org>]

commit 53d23688b4a88fbfcea91220938cb52bf106e562
Author: Benjamin Berg <bberg redhat com>
Date:   Mon Jan 4 11:40:36 2021 +0100

    README: Add Clayton TV as confirmed working

 README.md | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/README.md b/README.md
index a880441..f8be17c 100644
--- a/README.md
+++ b/README.md
@@ -32,6 +32,7 @@ The following devices have been tested:
  * LG WebOS TV
  * MontoView (Software Revision 2.18.02)
  * MiraScreen
+ * Clayton TV (model CL43UHD19BSW)
 
 Testing
 =======