Add CodeCov badge to readme file
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dilini-muthumala/siddhi,wso2/siddhi,ramindu90/siddhi,suhothayan/siddhi,gokul/siddhi,wso2/siddhi,tishan89/siddhi,grainier/siddhi,dilini-muthumala/siddhi,suhothayan/siddhi,gokul/siddhi,mohanvive/siddhi,mohanvive/siddhi,tishan89/siddhi,ramindu90/siddhi,grainier/siddhi