add server to monorepo.

packages/server/src/repositories/ExpenseEntryRepository.ts

@@ -0,0 +1,11 @@
+import TenantRepository from "./TenantRepository";
+import { ExpenseCategory } from 'models';
+
+export default class ExpenseEntryRepository extends TenantRepository {
+  /**
+   * Gets the repository's model.
+   */
+  get model() {
+    return ExpenseCategory.bindKnex(this.knex);
+  }
+}