✨ Add Marketstack node (#2033)

* Add Marketstack Node

* Add optional HTTPS support

* ⚡ Refactor Marketstack node

* 🔥 Remove logging

* ⚡ Small improvement

* 🐛 Fix issue validating error condition

Co-authored-by: Ed Linklater <github@ed.geek.nz>
Co-authored-by: ricardo <ricardoespinoza105@gmail.com>

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

@@ -0,0 +1,25 @@
+import {
+	ICredentialType,
+	NodePropertyTypes,
+} from 'n8n-workflow';
+
+export class MarketstackApi implements ICredentialType {
+	name = 'marketstackApi';
+	displayName = 'Marketstack API';
+	documentationUrl = 'marketstack';
+	properties = [
+		{
+			displayName: 'API Key',
+			name: 'apiKey',
+			type: 'string' as NodePropertyTypes,
+			default: '',
+		},
+		{
+			displayName: 'Use HTTPS',
+			name: 'useHttps',
+			type: 'boolean' as NodePropertyTypes,
+			default: false,
+			description: 'Use HTTPS (paid plans only).',
+		},
+	];
+}