query_time

Notable Changes:

• Query time option shows executing time in msec.
• Adding Verbose option for displaying DNS wire format request, debug for DNS wire answers.
• Support only valid Resource Records {A,AAAA,CNAME,MX,NS,SOA,SPF,SRV,TXT,CAA} not clear text, to avoid input error.
• Plain & Json output return full answer for RRs.
• Moving documentation to README