added MarkerPayload struct to handle marker requests payload

src/structs.rs

@@ -15,4 +15,10 @@ pub struct Marker {
   pub ce: Option<i32>,
   pub hae: Option<i32>,
   pub le: Option<i32>,
+}
+
+pub struct MarkerPayload {
+  pub api_address: String,
+  pub api_auth_token: String,
+  pub markers: [Marker],
 }