feat(invoice-ninja): add invoice ninja integration

packages/backend/src/apps/invoice-ninja/index.ts

@@ -0,0 +1,16 @@
+import defineApp from '../../helpers/define-app';
+import addAuthHeader from './common/add-auth-header';
+import auth from './auth';
+
+export default defineApp({
+  name: 'Invoice Ninja',
+  key: 'invoice-ninja',
+  baseUrl: 'https://invoiceninja.com',
+  apiBaseUrl: 'https://invoicing.co/api',
+  iconUrl: '{BASE_URL}/apps/invoice-ninja/assets/favicon.svg',
+  authDocUrl: 'https://automatisch.io/docs/apps/invoice-ninja/connection',
+  primaryColor: '000000',
+  supportsConnections: true,
+  beforeRequest: [addAuthHeader],
+  auth,
+});