✨ Add SendGrid node (#1321)

* ✨Add SendGrid node

* 👕Fix lint issue

* ⚡ Improvements

* ⚡ Improvements

* ⚡ Improvements

* ⚡ Fix SendGrid-Node

Co-authored-by: ricardo <ricardoespinoza105@gmail.com>
Co-authored-by: Jan Oberhauser <jan.oberhauser@gmail.com>

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

@@ -0,0 +1,18 @@
+import {
+	ICredentialType,
+	NodePropertyTypes,
+} from 'n8n-workflow';
+
+export class SendGridApi implements ICredentialType {
+	name = 'sendGridApi';
+	displayName = 'SendGrid API';
+	documentationUrl = 'sendgrid';
+	properties = [
+		{
+			displayName: 'API Key',
+			name: 'apiKey',
+			type: 'string' as NodePropertyTypes,
+			default: '',
+		},
+	];
+}