📝 Add Readme

README.md

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+# Inato `fp-ts` training
+
+This repo is a work in progress toward having a comprehensive training material
+to onboard people on using `fp-ts` efficiently.
+
+The exercices consist of unimplemented functions and their associated failing
+tests.
+
+To run the tests, simply run
+```sh
+$ yarn test
+```
+
+The exercices are organized into `exoN` folders and most of what is required to
+complete each is detailed in the comments.