add dashboard v2 license to readme (#18334)

README.md

@@ -20,6 +20,7 @@
   <a href="https://bestpractices.coreinfrastructure.org/projects/2231"><img src="https://bestpractices.coreinfrastructure.org/projects/2231/badge" alt="CII Best Practices"></a>
   <a href="https://scan.coverity.com/projects/netdata-netdata?tab=overview"><img alt="Coverity Scan" src="https://img.shields.io/coverity/scan/netdata"></a>
   <a href="https://www.gnu.org/licenses/gpl-3.0"><img src="https://img.shields.io/badge/License-GPL%20v3%2B-blue.svg" alt="License: GPL v3+"></a>
+  <a href="https://github.com/netdata/netdata/blob/master/src/web/gui/v2/LICENSE.md"><img src="https://img.shields.io/badge/License%20%28Dashboard%20v2%29-NCUL1-blue.svg" alt="License (Dashboard v2): NCUL1"></a>
   <br />
   <a href="https://community.netdata.cloud"><img alt="Discourse topics" src="https://img.shields.io/discourse/topics?server=https%3A%2F%2Fcommunity.netdata.cloud%2F&logo=discourse&label=discourse%20forum"></a>
   <a href="https://github.com/netdata/netdata/discussions"><img alt="GitHub Discussions" src="https://img.shields.io/github/discussions/netdata/netdata?logo=github&label=github%20discussions"></a>