Add artifact search link to readme

[karma4u101]

For example https://oss.sonatype.org/#nexus-search;gav~~fobo*~2.1.0~~ https://oss.sonatype.org/#nexus-search;quick~fobo*_3.0* or https://search.maven.org/#search%7Cga%7C1%7Ca%3Afobo*_3.0*%20AND%20v%3A%221.6%22

On the topic https://help.sonatype.com/repomanager2/using-the-user-interface/searching-for-components https://help.sonatype.com/repomanager3/user-interface/searching-for-components