feat: ✨ Ability to view stations from the API

Addition of a single component for stations; creation of structure; creation of function to retrieve bikes in real time

velibtracker/velibtrackerApp.swift

@@ -14,4 +14,7 @@ struct velibtrackerApp: App {
             ContentView()
         }
     }
+    init() {
+        fetchVelibData()
+    }
 }