add markdown support to the readme, close #8
add markdown support to the readme, close #8

notbalanced/jrnl,maebert/jrnl,zdravi/jrnl,MSylvia/jrnl,rzyns/jrnl,nikvdp/jrnl,MinchinWeb/jrnl,philipsd6/jrnl,beni55/jrnl,dzeban/jrnl,Shir0kamii/jrnl,cloudrave/jrnl-todos,flight16/jrnl