Add party an army sheeets

module/models/army.mjs

@@ -0,0 +1,13 @@
+export default class OathHammerArmy extends foundry.abstract.TypeDataModel {
+  static defineSchema() {
+    const { fields } = foundry.data
+    const schema = {}
+
+    schema.regimentRefs  = new fields.ArrayField(new fields.StringField({ required: true, blank: false }))
+    schema.leaderUuid    = new fields.StringField({ required: false, nullable: true, initial: null })
+    schema.location      = new fields.StringField({ required: false, nullable: true, initial: "" })
+    schema.notes         = new fields.HTMLField({ required: false, nullable: true, initial: "" })
+
+    return schema
+  }
+}