Add "Compare" functioanlity to SiteProfiler#38

Feature that will help users to compare two or more domains in SiteProfiler. it should help to identify which domain (website) is better than the other to get a better picture of website’s strenghts and value.

It should allow to compare in terms of:

• DA (Domain authority) /PA/CF/TF
• Alexa, Ref. IP, Shares
• Total backlinks count
• Organic traffic
• Common & unique competitors

Is there anything else you would liek to see comapared? Just comment below!