Update README

Signed-off-by: Sanchayan Maity <maitysanchayan@gmail.com>

README.md

@@ -1 +1,28 @@
-# free-monad-example
+# Free Monad sample project
+
+Using [Hydra](https://github.com/graninas/Hydra) as a reference for study.
+
+# Library
+
+https://hackage.haskell.org/package/free
+
+# Resources
+
+- [What are free monads](https://stackoverflow.com/questions/13352205/what-are-free-monads)
+- [You could have invented free monads](http://www.haskellforall.com/2012/06/you-could-have-invented-free-monads.html)
+- [Purify code using free monads](http://www.haskellforall.com/2012/07/purify-code-using-free-monads.html)
+- [What does free buy us](https://www.parsonsmatt.org/2017/09/22/what_does_free_buy_us.html)
+- [Random gist](https://gist.github.com/CMCDragonkai/165d9a598b8fb333ea65)
+- [Free Monads](https://www.tweag.io/blog/2018-02-05-free-monads/)
+- [Many roads to free monads](https://www.schoolofhaskell.com/user/dolio/many-roads-to-free-monads)
+- [Hierarchical Free Monads & Software Design in Functional Programming by Alexander Granin](https://www.youtube.com/watch?v=3GKQ4ni2pS0)
+
+# Free Monads Performance
+
+- [Asymptotic Improvement of Computations over Free Monads](https://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.143.2323&rep=rep1&type=pdf)
+- [Free Monads for less - Part 1](http://comonad.com/reader/2011/free-monads-for-less/)
+- [Free Monads for less - Part 2](http://comonad.com/reader/2011/free-monads-for-less-2/)
+- [Free Monads for less - Part 3](http://comonad.com/reader/2011/free-monads-for-less-3/)
+- [Kan Extensions](http://comonad.com/reader/2008/kan-extensions/)
+- [The Free and The Furious: And by 'Furious' I mean Codensity](https://www.youtube.com/watch?v=EiIZlX_k89Y)
+- [Effects for less - Great talk, must watch](https://www.youtube.com/watch?v=0jI-AlWEwYI)