Add 'Hacker News Tool' Chrome extension

Author: DeltaView

README.md

@@ -148,6 +148,7 @@ A collection of awesome [Hacker News](https://news.ycombinator.com/) apps, libra
 - [ModernHN](https://www.modernhn.com)
 - [HN discussions for the current page](https://discu.eu/extension/)
 - [Drake Rossman's Extension written in Rust WASM](https://drakerossman.com/blog/hackernews-userscript-in-rust-wasm)
+- [Hacker News Tools](https://chromewebstore.google.com/detail/hacker-news-tools/flhbhgflcehfhimejnjadbfpebhhaopi)
 
 ### Userscripts