More README.md improvements
More README.md improvements

maliayas/Validation,ahmetgunes/Validation,thedavidmeister/Validation,Ye-Yong-Chi/Validation,jpjoao/Validation,Whyounes/Validation,regdos/Validation,mrsoto/Validation,Respect/Validation,mubassirhayat/Validation,zinovyev/Validation,rozehnal/Validation,riyan8250/Validation,osiux/Validation,solvire/Validation,guilhermesiani/Validation,Respect/Validation,rogeriopradoj/Validation,hudolfhess/Validation,Respect52/Validation,lalocespedes/Validation