Enhance README with additional W3C specifications

Updated README to include W3C WoT Discovery and proposed specifications.

Author: benfrancis

README.md

@@ -2,7 +2,7 @@
 
 Node.js implementation of a W3C WoT web thing
 
-This is a work-in-progress pure Node.js replacement for the webthing-node library which will implement the W3C [WoT Thing Description](https://www.w3.org/TR/wot-thing-description/) and WoT Thing Protocol specifications.
+This is a work-in-progress pure Node.js replacement for the webthing-node library which will implement the [W3C WoT Thing Description](https://www.w3.org/TR/wot-thing-description/), [W3C WoT Discovery](https://www.w3.org/TR/wot-discovery/) and ([proposed](https://lists.w3.org/Archives/Public/public-web-thing-protocol/2026Mar/0001.html)) W3C WoT Thing Protocol specifications.
 
 ## Example Web Thing