init monlet repo with stage 0-2 (docs, contract, agent MVP)

agent/config.example.toml

@@ -0,0 +1,22 @@
+agent_id = "example-host-01"
+hostname = "example-host-01"
+mode = "hybrid"
+state_dir = "/var/lib/monlet-agent"
+
+[server]
+url = "http://127.0.0.1:8000"
+token = "replace-me"
+heartbeat_interval = "30s"
+batch_interval = "10s"
+
+[metrics]
+enabled = true
+listen = "127.0.0.1:9465"
+
+[[checks]]
+id = "disk_root"
+name = "Root disk usage"
+command = ["/usr/local/lib/monlet/check_disk_root.sh"]
+interval = "60s"
+timeout = "10s"
+notification_owner = "server"