Create README.md

added first steps for setup documentation

README.md

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+# Splittermond Roll-Butler
+## a JDA Discord Applet
+Discord-Bot built on JDA for use in Discord-based online PnP servers. Created for the german Pen-And-Paper "Splittermond" but useful for other PNP as well.
+
+## Features
+* dice throwing (1W10, 4W6, etc)
+* arithmetics supported (2W10 + 14)
+* secret gmroll and gm messaging features
+* bullshit-bingo for selecting a random predefined item
+* battle-map for keeping track everyones turn during battles
+
+## Setup
+### Windows
+- download latest .jar from releases and move it into its own folder
+- add bottoken.txt with only your bottoken to the same folder
+- execute program with java
+
+### Linux
+- WIP