Node-API.md

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+After PiCLuster 2.0, the /nodes API call was updated to provide system metrics and detailed information. This is now the main way how the Webconsole and Server receive information from the cluster nodes.
+
+```
+{
+	data: [{
+		cpu_percent: 89.73840690750971,
+		hostname: 'macbook-pro-2.lan',
+		os_type: 'darwin',
+		disk_percentage: 36,
+		total_running_containers: 1,
+		running_containers: [Array],
+		images: [Array],
+		cpu_cores: 4,
+		memory_percentage: 64
+	}],
+	total_containers: 0,
+	total_nodes: 1,
+	container_list: ['nginx', 'minio'],
+	nodes: ['localhost']
+}
+```