Add Affine (#1200)

README.md

@@ -154,6 +154,7 @@ Any comments, suggestions? [Let us know!](https://github.com/jaywcjlove/awesome-
 
 #### Note-taking
 
+* [Affine](https://affine.pro/) - Affine is the next-generation collaborative knowledge base for professionals. [![Open-Source Software][OSS Icon]](https://github.com/toeverything/AFFiNE) ![Freeware][Freeware Icon]
 * [Agenda](https://agenda.com/) - Date-focused note taking app for both planning and documenting your projects. [![App Store][app-store Icon]](https://itunes.apple.com/app/id1287445660?mt=12)
 * [AppFlowy](https://www.appflowy.io/) - Open-source alternative to Notion. [![Open-Source Software][OSS Icon]](https://github.com/AppFlowy-IO/appflowy) ![Freeware][Freeware Icon]
 * [Bear Writer](http://www.bear-writer.com/) - Beautiful, flexible writing app for crafting notes and prose. [![App Store][app-store Icon]](https://itunes.apple.com/us/app/bear-beautiful-writing-app/id1091189122?ls=1&mt=12)