Update README.md

Author: fiskce

README.md

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+[1] Attention! make sure your steam account you are using owns the game or else the mod installation part will fail.
+[2] Attention! in some cases the steamcmd wont install the mpmission scripts. if this happens create the "mpmissions" folder and download the mission scripts from [DayZ Central Economy](https://github.com/BohemiaInteractive/DayZ-Central-Economy)
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 # DayZ Server Manager for Linux Server Instances
 
 ![](https://edge-prodberiffagroup.b-cdn.net/web/dayzservermanagerheadlinegifsmall-revisedyellow.gif)