Add cap color to model

Sources/App/Cap.swift

@@ -11,7 +11,9 @@ struct Cap: Codable {
     var mainImage: Int
 
     /// The version of the first classifier trained on this cap
-    var classifierVersion: Int
+    var classifierVersion: Int?
+
+    var color: Color?
 
     enum CodingKeys: String, CodingKey {
         case id = "i"
@@ -19,6 +21,16 @@ struct Cap: Codable {
         case count = "c"
         case mainImage = "m"
         case classifierVersion = "v"
+        case color = "f"
+    }
+
+    struct Color: Codable, Equatable {
+
+        let r: Int
+
+        let g: Int
+
+        let b: Int
     }
 }