add znai as user

Author: MykolaGolubyev

README.md

@@ -423,6 +423,7 @@ Some users of this library (feel free to raise a PR if you want to be added):
 * Atlassian (where the library was initially developed)
 * Java (OpenJDK), see [here](https://github.com/openjdk/jdk/blob/3895b8fc0b2c6d187080dba6fe08297adad4a480/src/jdk.internal.md/share/classes/module-info.java)
 * Gitiles/Gerrit, see [here](https://gerrit-review.googlesource.com/c/gitiles/+/353794)
+* Znai, see [here](https://github.com/testingisdocumenting/znai)
 
 See also
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