Add a disclaimer (#1834)

* Update README.md

Disclaimer was added at the request of @germanosin

* Fix link

Co-authored-by: Roman Zabaluev <rzabaluev@provectus.com>

README.md

@@ -7,7 +7,10 @@
 [![Release version](https://img.shields.io/github/v/release/provectus/kafka-ui)](https://github.com/provectus/kafka-ui/releases)
 [![Chat with us](https://img.shields.io/discord/897805035122077716)](https://discord.gg/4DWzD7pGE5)
 
-<em>UI for Apache Kafka is a free, open-source web UI to monitor and manage Apache Kafka clusters. </em> 
+### DISCLAIMER
+<em>UI for Apache Kafka is a free, open-source tool that is curated by Provectus, and is built and supported by the open-source community. The tool will remain free and open-source in the future. Provectus does not plan to add any paid features or subscription plans so that everyone can have a better experience observing their data. UI for Apache Kafka is a part of the [Provectus NextGen Data Platform](https://provectus.com/nextgen-data-platform/). Check it out for more details! </em> 
+
+#### UI for Apache Kafka is a free, open-source web UI to monitor and manage Apache Kafka clusters. 
 
 UI for Apache Kafka is a simple tool that makes your data flows observable, helps find and troubleshoot issues faster and deliver optimal performance. Its lightweight dashboard makes it easy to track key metrics of your Kafka clusters - Brokers, Topics, Partitions, Production, and Consumption.