Update README.md

README.md

@@ -14,6 +14,10 @@ http://adguard.com
 Or directly by this link: 
 https://static.adguard.com/mac/Adguard.release.dmg
 
+### How to become a beta tester?
+
+All information related to Adguard beta-testing is collected in this [blog article](https://blog.adguard.com/en/adguard-beta-test/). 
+
 ### Our plans
 
 To see the 'big picture', watch current progress and get an idea of approximate dates for Mac releases, see this page: https://github.com/AdguardTeam/AdguardForMac/milestones