Add party an army sheeets

module/models/party.mjs

@@ -0,0 +1,24 @@
+export default class OathHammerParty extends foundry.abstract.TypeDataModel {
+  static defineSchema() {
+    const { fields } = foundry.data
+    const requiredInteger = { required: true, nullable: false, integer: true }
+    const schema = {}
+
+    schema.notes = new fields.HTMLField({ required: false, nullable: true, initial: "" })
+
+    // Ordered list of character actor IDs — position = marching order
+    schema.memberRefs = new fields.ArrayField(
+      new fields.StringField({ required: true, nullable: false, blank: false })
+    )
+
+    schema.treasury = new fields.SchemaField({
+      gp: new fields.NumberField({ ...requiredInteger, initial: 0, min: 0 }),
+      sp: new fields.NumberField({ ...requiredInteger, initial: 0, min: 0 }),
+      cp: new fields.NumberField({ ...requiredInteger, initial: 0, min: 0 }),
+    })
+
+    return schema
+  }
+
+  static LOCALIZATION_PREFIXES = ["OATHHAMMER.Party"]
+}