add network and device structure

src/main.cpp

@@ -0,0 +1,14 @@
+#include <iostream>
+
+#include "Netsim.hpp"
+
+int main(int argc, char** argv) {
+    Network network("Testnet");
+
+    network.addDevice(Device::create("FA:56:A7:12:04:ED"));
+    network.addDevice(Device::create("87:1A:B5:77:3D:33"));
+
+    std::cout << network << std::endl;
+
+    return 0;
+}