feat(Citrix ADC): add Citrix ADC node (#4274)

* ✨ Citrix ADC node

* 🐛 Fix typo in codex file

* ⚡ Remove trailing slash if there is one

* ⚡ Add certificate resource

* 🐛 Fix merge conflict issue

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

@@ -0,0 +1,55 @@
+import {
+	IAuthenticateGeneric,
+	ICredentialTestRequest,
+	ICredentialType,
+	INodeProperties,
+} from 'n8n-workflow';
+
+export class CitrixAdcApi implements ICredentialType {
+	name = 'citrixAdcApi';
+	displayName = 'Citrix ADC API';
+	documentationUrl = 'citrix';
+	properties: INodeProperties[] = [
+		{
+			displayName: 'URL',
+			name: 'url',
+			type: 'string',
+			default: '',
+			required: true,
+		},
+		{
+			displayName: 'Username',
+			name: 'username',
+			type: 'string',
+			default: '',
+			required: true,
+		},
+		{
+			displayName: 'Password',
+			name: 'password',
+			type: 'string',
+			default: '',
+			required: true,
+			typeOptions: {
+				password: true,
+			},
+		},
+	];
+
+	authenticate: IAuthenticateGeneric = {
+		type: 'generic',
+		properties: {
+			headers: {
+				'X-NITRO-USER': '={{$credentials.username}}',
+				'X-NITRO-PASS': '={{$credentials.password}}',
+			},
+		},
+	};
+
+	test: ICredentialTestRequest = {
+		request: {
+			baseURL: '={{$credentials.url}}',
+			url: '/nitro/v1/config/nspartition?view=summary',
+		},
+	};
+}