Create ZapSign n8n node with comprehensive documentation and implementation

Co-authored-by: andre <andre@zapsign.com.br>

credentials/ZapSignApi.credentials.ts

@@ -0,0 +1,61 @@
+import {
+	IAuthenticateGeneric,
+	ICredentialTestRequest,
+	ICredentialType,
+	INodeProperties,
+} from 'n8n-workflow';
+
+export class ZapSignApi implements ICredentialType {
+	name = 'zapSignApi';
+	displayName = 'ZapSign API';
+	documentationUrl = 'https://docs.zapsign.com.br/';
+	properties: INodeProperties[] = [
+		{
+			displayName: 'API Key',
+			name: 'apiKey',
+			type: 'string',
+			typeOptions: {
+				password: true,
+			},
+			default: '',
+			required: true,
+			description: 'Your ZapSign API key',
+		},
+		{
+			displayName: 'Environment',
+			name: 'environment',
+			type: 'options',
+			options: [
+				{
+					name: 'Production',
+					value: 'production',
+				},
+				{
+					name: 'Sandbox',
+					value: 'sandbox',
+				},
+			],
+			default: 'production',
+			description: 'The environment to use',
+		},
+	];
+
+	authenticate: IAuthenticateGeneric = {
+		type: 'generic',
+		properties: {
+			headers: {
+				'Authorization': '=Bearer {{$credentials.apiKey}}',
+				'Content-Type': 'application/json',
+				'Accept': 'application/json',
+			},
+		},
+	};
+
+	test: ICredentialTestRequest = {
+		request: {
+			baseURL: '={{$credentials.environment === "sandbox" ? "https://sandbox.api.zapsign.com" : "https://api.zapsign.com"}}',
+			url: '/v1/me',
+			method: 'GET',
+		},
+	};
+}