docs: Add crictl example json files

Add basic sample pod/container config files to show
how to use `crictl` with Kata containers.

Fixes: #881

Signed-off-by: bin liu <bin@hyper.sh>

docs/how-to/data/crictl/busybox/container_config.json

@@ -0,0 +1,18 @@
+{
+	"metadata": {
+		"name": "busybox-container"
+	},
+	"image": {
+		"image": "docker.io/library/busybox:latest"
+	},
+	"command": [
+		"sleep",
+		"9999"
+	],
+	"args": [],
+	"working_dir": "/",
+	"log_path": "",
+	"stdin": false,
+	"stdin_once": false,
+	"tty": false
+}

docs/how-to/data/crictl/busybox/sandbox_config.json

@@ -0,0 +1,19 @@
+{
+	"metadata": {
+		"name": "busybox-pod",
+		"uid": "busybox-pod"
+	},
+	"hostname": "busybox_host",
+	"log_directory": "",
+	"dns_config": {
+	},
+	"port_mappings": [],
+	"resources": {
+	},
+	"labels": {
+	},
+	"annotations": {
+	},
+	"linux": {
+	}
+}