added code for agent to ping central drone server

model/agent.go

@@ -0,0 +1,10 @@
+package model
+
+type Agent struct {
+	ID       int64  `json:"id"         meddler:"agent_id,pk"`
+	Address  string `json:"address"    meddler:"agent_addr"`
+	Platform string `json:"platform"   meddler:"agent_platform"`
+	Capacity int    `json:"capacity"   meddler:"agent_capacity"`
+	Created  int64  `json:"created_at" meddler:"agent_created"`
+	Updated  int64  `json:"updated_at" meddler:"agent_updated"`
+}