add QOI.jl to read and save the qoi image format (#354)

Co-authored-by: Johnny Chen <johnnychen94@hotmail.com>

Author: Kristoffer Carlsson

src/registry.jl

@@ -489,3 +489,5 @@ add_format(format"FCS", "FCS", [".fcs"], [:FCSFiles => UUID("d76558cf-badf-52d4-
 add_format(format"HTML", (), [".html", ".htm"], [MimeWriter, SAVE])
 
 add_format(format"MIDI", "MThd", [".mid", ".midi", ".MID"], [:MIDI => UUID("f57c4921-e30c-5f49-b073-3f2f2ada663e")])
+
+add_format(format"QOI", "qoif", ".qoi", [:QOI => UUID("4b34888f-f399-49d4-9bb3-47ed5cae4e65")], [idImageIO])