Add new CHANGLOG.md to track changes between releases.
Add new CHANGLOG.md to track changes between releases.

dkelmer/splunk-sdk-java,dkelmer/splunk-sdk-java,splunk/splunk-sdk-java,dkelmer/splunk-sdk-java,splunk/splunk-sdk-java,dkelmer/splunk-sdk-java,splunk/splunk-sdk-java,splunk/splunk-sdk-java,splunk/splunk-sdk-java,dkelmer/splunk-sdk-java,splunk/splunk-sdk-java