Task: Create a new contact in Agile CRM

n8n workflow:
{"id":"96","name":"Create a new contact in Agile CRM","nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[250,300],"parameters":{},"typeVersion":1},{"name":"AgileCRM","type":"n8n-nodes-base.agileCrm","position":[450,300],"parameters":{"operation":"create","additionalFields":{"lastName":"","firstName":""}},"credentials":{"agileCrmApi":""},"typeVersion":1}],"active":false,"settings":{},"connections":{"On clicking 'execute'":{"main":[[{"node":"AgileCRM","type":"main","index":0}]]}}}