Updating customization.md document to include information about custom column component metadata
Updating customization.md document to include information about custom column component metadata

Ent-ch/Griddle,Shop2market/Griddle,namjul/Griddle,GriddleGriddle/Griddle,ntdat3011/Griddle,kevinold/Griddle,ttrentham/Griddle,amorphousxd/griddle-ets,Kikonejacob/Griddle,joellanciaux/Griddle,saary/Griddle,rovolution/Griddle,joellanciaux/Griddle,GriddleGriddle/Griddle,Jravvit/Griddle