Added Plainpad in Note-Taking section.

README.md

@@ -1115,6 +1115,7 @@ See https://github.com/n1trux/awesome-sysadmin#monitoring and https://github.com
 - [MiniNote](https://github.com/n1try/mininote) - Simple Markdown note-taking app with persistence. `MIT` `Nodejs`
 - [OpenNote](https://github.com/FoxUSA/OpenNote) - OpenNote was built to be an open web-based alternative to Microsoft OneNote (T) and EverNote. ([Demo](https://foxusa.github.io/OpenNote/OpenNote/#/folder)) `MIT` `HTML5`
 - [Paperwork](https://paperwork.cloud) - OpenSource note-taking and archiving alternative to Evernote, Microsoft OneNote and Google Keep. ([Source Code](https://github.com/paperwork/paperwork)) `MIT` `PHP`
+- [Plainpad](https://alextselegidis.com/get/plainpad/) - A modern note taking application for the cloud, utilizing the best features of progressive web apps technology. ([Demo](https://alextselegidis.com/try/plainpad/), [Source Code](https://github.com/alextselegidis/plainpad)) `GPL-3.0` `PHP`
 - [savepad](https://github.com/shelltr/textpad) - Minimalist notepad based on notepad.cc. `MIT` `PHP`
 - [ShareLaTex](https://www.sharelatex.com/) - Web-based collaborative LaTeX editor. ([Source Code](https://github.com/sharelatex/sharelatex)) `AGPL-3.0` `Ruby`
 - [Standard Notes](https://standardnotes.org) - Simple and private notes app. Protect your privacy while getting more done. That's Standard Notes. ([Demo](https://app.standardnotes.org/), [Source Code](https://github.com/standardnotes)) `GPL-3.0` `Ruby`