Update README.md

README.md

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 # SpotifyDedupe
+This command-line-tool removes all duplicate tracks (also from different releases, matching by Trackname and Artists) from a spotify playlist.
+---
+
+## Prerequisites
+ - A Spotify application
+ - Java 19 (as this tool is not shipped with a JRE you may need to install a JDK)
+ - Usage on Linux requires having xdg-open installed
+
+## Setup
+### Spotify
+1. Visit [the Spotify Developer Dashboard](https://developer.spotify.com/dashboard/)
+2. Create an app
+3. In the "Users and Access" menu, add your Email-Address and Name
+4. In the "Edit Settings" add "http://localhost:9876/callback/spotify/" as a Redirect URI
+5. Note your Client ID and Client Secret
+6. 
+
+## Usage
+In your command line run ```java -jar bsu-dedupe-%version%.jar [arguments]```.