✨ Add Customer.io-Node (#833)

* 🚧 Descriptions, node function, generic function changes

* ✅ Finished functionality, added icon

* ⚡ Added new campaign operations, acommodated for 2 different authentications

* ⚡ Fixed number defaults not being numbers but empty strings

packages/nodes-base/nodes/CustomerIo/SegmentDescription.ts

@@ -0,0 +1,71 @@
+import { INodeProperties } from 'n8n-workflow';
+
+export const segmentOperations = [
+	{
+		displayName: 'Operation',
+		name: 'operation',
+		type: 'options',
+		displayOptions: {
+			show: {
+				resource: [
+					'segment',
+				],
+			},
+		},
+		options: [
+			{
+				name: 'Add Customer',
+				value: 'add',
+			},
+			{
+				name: 'Remove Customer',
+				value: 'remove',
+			},
+		],
+		default: 'add',
+		description: 'The operation to perform.',
+	},
+] as INodeProperties[];
+
+export const segmentFields = [
+
+/* -------------------------------------------------------------------------- */
+/*                                   segment:add                              */
+/* -------------------------------------------------------------------------- */
+	{
+		displayName: 'ID',
+		name: 'id',
+		type: 'number',
+		required: true,
+		default: 0,
+		displayOptions: {
+			show: {
+				resource: [
+					'segment',
+				],
+				operation: [
+					'add', 'remove'
+				]
+			},
+		},
+		description: 'The unique identifier of the segment.',
+	},
+	{
+		displayName: 'IDs',
+		name: 'ids',
+		type: 'string',
+		required: true,
+		default: '',
+		displayOptions: {
+			show: {
+				resource: [
+					'segment',
+				],
+				operation: [
+					'add', 'remove'
+				]
+			},
+		},
+		description: 'A list of customer ids to add to the segment.',
+	},
+] as INodeProperties[];