NetworkServer: Add a new NetworkServer service

This service is responsible for loading network configuration from a
/etc/Network.ini config file. It sets up static IP address + mask or
starts DHCPClient depending on configuration.

Userland/Services/NetworkServer/CMakeLists.txt

@@ -0,0 +1,12 @@
+serenity_component(
+    NetworkServer
+    REQUIRED
+    TARGETS NetworkServer
+)
+
+set(SOURCES
+    main.cpp
+)
+
+serenity_bin(NetworkServer)
+target_link_libraries(NetworkServer LibCore LibConfig LibMain)