README.rst: Added CRUD examples as mini-documentation
README.rst: Added CRUD examples as mini-documentation

lzedl/PyMySQL,pymysql/pymysql,nju520/PyMySQL,anson-tang/PyMySQL,boneyao/PyMySQL,jheld/PyMySQL,eibanez/PyMySQL,methane/PyMySQL,DashaChuk/PyMySQL,NunoEdgarGub1/PyMySQL,Ting-y/PyMySQL,MartinThoma/PyMySQL,yeyinzhu3211/PyMySQL,eibanez/PyMySQL,xjzhou/PyMySQL,modulexcite/PyMySQL,xjzhou/PyMySQL,yeyinzhu3211/PyMySQL,lzedl/PyMySQL,wraziens/PyMySQL,PyMySQL/PyMySQL,wraziens/PyMySQL