Add SG colour palettes #56

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5 warnings

file=R/colour_table.R,line=19,col=6,[indentation_linter] Hanging indent should be 19 spaces but is 6 spaces.

file=R/sg_palette.R,line=24,col=19,[indentation_linter] Hanging indent should be 18 spaces but is 19 spaces.

file=R/sg_palette.R,line=33,col=8,[indentation_linter] Indentation should be 10 spaces but is 8 spaces.

file=vignettes/cookbook/_chart-types.Rmd,line=139,col=20,[indentation_linter] Hanging indent should be 30 spaces but is 20 spaces.

file=vignettes/cookbook/_customisations.Rmd,line=155,col=19,[indentation_linter] Hanging indent should be 18 spaces but is 19 spaces.