Stub NetworkManager, remove pixel test image, added icon for releasy

lib/managers/network_manager.rb

@@ -0,0 +1,26 @@
+class IMICFPS
+  class NetworkManager
+    MULTICAST_ADDRESS = "224.0.0.1"
+    MULTICAST_PORT = 30_000
+
+    REMOTE_GAMEHUB = "i-mic.rubyclan.org"
+    REMOTE_GAMEHUB_PORT = 98765
+
+    DEFAULT_SERVER_HOST = "0.0.0.0"
+    DEFAULT_SERVER_PORT = 56789
+    DEFAULT_SERVER_QUERY_PORT = 28900
+    def initialize
+    end
+
+    # https://github.com/jpignata/blog/blob/master/articles/multicast-in-ruby.md
+    def broadcast_lan_lobby
+      socket = UDPSocket.open
+      socket.setsockopt(:IPPROTO_IP, :IP_MULTICAST_TTL, 1)
+      socket.send("IMICFPS_LAN_LOBBY", 0, MULTICAST_ADDRESS, MULTICAST_PORT)
+      socket.close
+    end
+
+    def handle_lan_multicast
+    end
+  end
+end