Adding some docs for sqlite ext
Adding some docs for sqlite ext

new-xiaji/peewee,coleifer/peewee,mackjoner/peewee,jarrahwu/peewee,Sunzhifeng/peewee,bopo/peewee,jnovinger/peewee,Dipsomaniac/peewee,new-xiaji/peewee,coleifer/peewee,wenxer/peewee,teserak/peewee,ghukill/peewee,zhang625272514/peewee,d1hotpep/peewee,jnovinger/peewee,jarrahwu/peewee,coreos/peewee,Sunzhifeng/peewee,ronyb29/peewee,coleifer/peewee,softside/peewee,fuzeman/peewee,new-xiaji/peewee,Sunzhifeng/peewee,bopo/peewee,jarrahwu/peewee,Dipsomaniac/peewee,coreos/peewee,zhang625272514/peewee,lez/peewee,py4a/peewee,bopo/peewee,stas/peewee,fuzeman/peewee,d1hotpep/peewee,zhang625272514/peewee,Dipsomaniac/peewee,wenxer/peewee,coreos/peewee