Update installation.md

docs/core/installation.md

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+# Installation
+
+This is the core package that needs to be installed for all other ExAd plugins/addons to work. 
+
+IMPORTANT!! 
+Keep the folder struction att all time when copying over files.
+
+## Client
+* Copy missionconfig classes from "mpmissions\Exile.Altis\description.ext\" into your own description.ext  
+Make sure their is only one appeareance of each Cfg class, e.g.  
+  This will break the missionfile
+```cpp
+class CfgFunctions
+{
+	#include "ExAdClient\CfgFunctions.cpp"
+};
+
+class CfgFunctions
+{
+	#include "SOMEOTHER_ADDON\CfgFunctions.cpp"
+};
+```  
+  This will work  
+```cpp
+class CfgFunctions
+{
+	#include "ExAdClient\CfgFunctions.cpp"
+	#include "SOMEOTHER_ADDON\CfgFunctions.cpp"
+};
+```  
+* Copy over "Core" from "mpmissions\Exile.Altis\ExAd\Core"
+
+## Server 
+
+* Navigate to "@ExileServer\addons\" 
+* Copy "exad_core"
+* Pack exad_core into a .pbo file.
+