feat(Hubspot): Add support for Private App Token Authentication

packages/nodes-base/credentials/HubspotAppToken.credentials.ts

@@ -0,0 +1,18 @@
+import {
+	ICredentialType,
+	INodeProperties,
+} from 'n8n-workflow';
+
+export class HubspotAppToken implements ICredentialType {
+	name = 'hubspotAppToken';
+	displayName = 'Hubspot App Token';
+	documentationUrl = 'hubspot';
+	properties: INodeProperties[] = [
+		{
+			displayName: 'App Token',
+			name: 'appToken',
+			type: 'string',
+			default: '',
+		},
+	];
+}