Get docs in line and added networking manual

luacs-docs/lua/manual/networking.md

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+# Networking
+
+# Singleplayer
+Singleplayer is the easiest of all, as there's no networking, so everything is already synced for you!
+In singleplayer the global variable `CLIENT` is set to true and `Game.IsSingleplayer` is also true.
+
+# Server
+The server is responsible for receiving inputs from clients and syncing state with all other clients. 
+The global variable `SERVER` is set to true if we are a server.
+The only difference between a **Dedicated Server** and a **Player-Hosted Server** in Barotrauma is the fact that the latter uses Steam Networking to communicate with clients, if you for some reason want to know if you are running inside a Dedicated Server, you can use `Game.IsDedicated`.
+
+# Client
+The client is the one who connects to servers. The global variable `CLIENT` is set to true and `Game.IsMultiplayer` is also true.
+
+# Syncing
+
+## Serializable Properties
+Serializable Properties are special members that are able to be synced with clients (and also with the server in some cases), they are very useful for server-side only code.
+
+Example showing how to sync the sprite color of an item without any client-side code:
+
+```
+local item = ...
+
+item.SpriteColor = Color(0, 0, 255, 255)
+
+local property = item.SerializableProperties[Identifier("SpriteColor")]
+Networking.CreateEntityEvent(item, Item.ChangePropertyEventData(property))
+```
+
+This is also possible to do with item components:
+
+```
+local item = ...
+local light = item.GetComponentString("LightComponent")
+
+light.LightColor = Color(0, 0, 255, 255)
+local property = light.SerializableProperties[Identifier("LightColor")]
+Networking.CreateEntityEvent(item, Item.ChangePropertyEventData(property))    
+```
+
+## Sending Custom Net Messages
+
+This is one of the ways you can send data between the client and server.
+
+Example on sending data from client to server
+
+```
+if CLIENT then
+    -- send from client to server
+    local message = Networking.Start("something")
+    message.WriteString("hello")
+    Networking.Send(message)
+end
+
+if SERVER then
+    -- receive in server
+    Networking.Receive("something", function(message, client)
+        print(client.Name .. " sent " .. message.ReadString())
+    end)
+end
+```
+
+Example on sending data from server to client
+
+```
+if CLIENT then
+    Networking.Receive("something", function(message)
+        print(message.ReadString())
+    end)
+end
+
+if SERVER then
+    -- send from server to client
+    local message = Networking.Start("something")
+    message.WriteString("hello")
+    Networking.Send(message, Client.ClientList[1].Connection)
+end
+```