update readme

README.md

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+wip
+
+
+### task_tracker setup:
+
+Last.fm api calls are queued to [task_tracker](https://github.com/simon987/task_tracker/),
+ and results are gathered by a [task_tracker_drone](https://github.com/simon987/task_tracker_drone/) 
+ ([script](https://git.simon987.net/drone/last.fm/src/master/run)).
+
+
+Project secret:
+```json
+{
+	"apikey": "<Your Last.fm api key>",
+	"user": "<Your Last.fm username>"
+}
+```