Add Heynote (#1702)

* Update README.md

* Update README.md

Author: jacobdalamb

README.md

@@ -318,6 +318,7 @@ Any comments, suggestions? [Let us know!](https://github.com/jaywcjlove/awesome-
 * [Zotero](https://www.zotero.org/) - Free tool to collect, organize, annotate, cite, and share research. [![OSS][OSS Icon]](https://github.com/zotero/zotero/) ![Freeware][Freeware Icon]
 * [Collate](https://collate.one/get-started) - Free tool to collect, summarize and query PDFs with AI. All offline and free. [![App Store][app-store Icon]](https://apps.apple.com/us/app/collateai/id6447429913) ![Freeware][Freeware Icon]
 * [PDFsail](https://pdfsail.com/) - PDFsail offers free online PDF tools for editing, converting, merging, compressing, and OCR. No download required. Try this AI-powered all-in-one PDF solution now!.
+* [Heynote](https://heynote.com/) - A dedicated scratchpad for developers. ![Freeware][Freeware Icon] ![Open-Source Software][OSS Icon] 
 
 ## Developer Tools