Create Player data model

module/data/Player.mjs

@@ -0,0 +1,29 @@
+export class PlayerData extends foundry.abstract.TypeDataModel {
+	static defineSchema() {
+		const fields = foundry.data.fields;
+		return {
+			content: new fields.HTMLField({
+				blank: true,
+				trim: true,
+				initial: ``,
+			}),
+			attr: new fields.TypedObjectField(
+				new fields.SchemaField({
+					name: new fields.StringField({ blank: false, trim: true }),
+					value: new fields.NumberField({ min: 0, initial: 0, integer: true, nullable: false }),
+					max: new fields.NumberField({ min: 0, initial: 0, integer: true, nullable: true }),
+					isRange: new fields.BooleanField({ initial: false, nullable: false }),
+				}),
+				{
+					initial: {},
+					nullable: false,
+					required: true,
+				},
+			),
+		};
+	};
+
+	get hasAttributes() {
+		return Object.keys(this.attr).length > 0;
+	};
+};