Add readme

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 # mirror-ball
+
+To compile and run, one has to first download [stack](https://docs.haskellstack.org/en/stable/README/)
+
+The simplest way to do this is by executing the following command:
+
+``` shell
+curl -sSL https://get.haskellstack.org/ | sh
+```
+
+Then run setup in this directory:
+
+``` shell
+stack setup
+```
+
+Finally the executable can be built and run using the following:
+
+``` shell
+stack build --exec mirror-ball
+```