✨ Add basic Mattermost-Node

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

@@ -0,0 +1,24 @@
+import {
+	ICredentialType,
+	NodePropertyTypes,
+} from 'n8n-workflow';
+
+
+export class MattermostApi implements ICredentialType {
+	name = 'mattermostApi';
+	displayName = 'Mattermost API';
+	properties = [
+		{
+			displayName: 'Access Token',
+			name: 'accessToken',
+			type: 'string' as NodePropertyTypes,
+			default: '',
+		},
+		{
+			displayName: 'Base URL',
+			name: 'baseUrl',
+			type: 'string' as NodePropertyTypes,
+			default: '',
+		},
+	];
+}