Update README.md

Author: devalex88

README.md

@@ -21,6 +21,26 @@ https://github.com/katalon-studio/katalon-recorder-samples
 
 https://github.com/katalon-studio/katalon-recorder-sample-plugin
 
+## Acknowledgments
+
+We would like to take this opportunity to express our warmest thanks to Katalon Recorder users and other open-source projects, especially:
+
+* Selenium IDE Project - [http://www.seleniumhq.org](http://www.seleniumhq.org/).
+
+* SideeX - https://github.com/SideeX/sideex.
+
+* Robot Framework Formatter Project - https://github.com/ngocbv/Robot-Framework-Formatter.
+
+* Formatter for C# with MSTest is provided by [Mark Gibson](https://forum.katalon.com/discussion/4209/export-to-c-with-webdriver-and-mstest).
+
+* @Patrick_Groot, @Piotr, @Mark_Gibson and other active members who have provided a lot of valuable suggestions and bug reports. Please forgive us if your name is missing here.
+
+* Plugin developers:
+
+  * Jan Esser - PHPUnit formatter for Katalon Recorder ([Chrome](https://chrome.google.com/webstore/detail/phpunit-formatter-for-kat/gelokgfkbnkkcdbokielchgpfnphoalk?utm_source=chrome-ntp-icon))
+
+  * Sam Kirkland - Puppeteer exporter for Katalon Recorder (https://github.com/SamKirkland/Puppeteer-exporter-for-Katalon-Recorder)
+
 ## License
 
 See NOTICE, LICENSE, and KATALON RECORDER OPEN-SOURCE LICENSE AGREEMENT.