Update gitignore

Author: leonardosnt

.gitignore

@@ -1,4 +1,4 @@
-lib/ 
+lib/*.dll 
 bin/ 
 obj/
 .vs/ 

lib/-- README.txt

@@ -0,0 +1,10 @@
+Lib files:
+
+- Assembly-CSharp.dll            from Rocket/Unturned
+- Assembly-CSharp-firstpass.dll  from Rocket/Unturned
+- Newtonsoft.Json.dll            from Unturned
+- Rocket.API.dll                 from Rocket
+- Rocket.Core.dll                from Rocket
+- Rocket.Unturned.dll            from Rocket
+- UnityEngine.dll                from Rocket/Unturned
+- uEssentials.dll                from uEssentials (uEssentials plugin dll)