improve readme

README.md

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-# eu4 to json
-Simple command line application that parses some data from an Europa Universalis 4 save game (.eu4) and outputs it to a .json.
+# EU4 to Json
+Simple command line application that parses some data from an Europa Universalis 4 save game (.eu4) and outputs it to a .json. Available for Windows & Linux.
+
+## Getting started
+### Prerequisites
+You need [7-Zip](https://www.7-zip.org/) to unpack the program and the [.NET Core 3.1 Runtime](https://dotnet.microsoft.com/download) to run it.
+
+### Installation & Run
+1. Unpack the .7zip to the desired location.
+2. Execute the EU4 to Json with the path to a .eu4 save game. 
+
+   On Linux: `./EU4ToJson savegame.eu4`
+
+   on Windows: `EU4ToJson.exe savegame.eu4`
+
+3. EU4 to Json will create the .json at the same location of the save game and with the same name (expect the file ending). 
+
+**Caution: If the .json already exists it will be overwritten!** 
+
+## Build with 
+* [Pdoxcl2Sharp](https://github.com/nickbabcock/Pdoxcl2Sharp)
+* [Json.NET](https://www.newtonsoft.com/json)
+
+
+## Build
+```
+dotnet publish -c Release --no-self-contained -r linux-x64
+dotnet publish -c Release --no-self-contained -r win10-x64
+```