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README.md

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+# Playground - Exn
+
+Context aware errors.
+
+https://github.com/fast/exn
+
+https://fast.github.io/blog/stop-forwarding-errors-start-designing-them/
+
+example output:
+
+```
+the program died, at src/main.rs:35:34
+|
+|-> failed to create file: res/foo.txt, at src/main.rs:79:43
+|
+|-> Permission denied (os error 13), at src/main.rs:79:43
+```