[io grant] Add "The Basics" section to TDIOG
[io grant] Add "The Basics" section to TDIOG

(Links to currently non-existent IO::CatHandle, but it will
exist soon)

dmaestro/doc,MasterDuke17/doc,gfldex/doc,gfldex/doc,antquinonez/doc,antquinonez/doc,MasterDuke17/doc,gfldex/doc,MasterDuke17/doc,tbrowder/doc,jonathanstowe/doc,jonathanstowe/doc,stmuk/doc,dmaestro/doc,jonathanstowe/doc,MasterDuke17/doc,jonathanstowe/doc,antquinonez/doc,antquinonez/doc,dmaestro/doc,dmaestro/doc,gfldex/doc,antquinonez/doc,stmuk/doc,perl6/doc,perl6/doc,tbrowder/doc,tbrowder/doc,perl6/doc,dmaestro/doc,stmuk/doc,tbrowder/doc,stmuk/doc,jonathanstowe/doc,perl6/doc,stmuk/doc,perl6/doc,gfldex/doc