Add links to various posts on CPS

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

continuations.md

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+http://okmij.org/ftp/continuations/#tutorial
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+http://okmij.org/ftp/Haskell/types.html
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+https://gist.github.com/lexi-lambda/d97b8187a9b63619af29689e9fa1b880
+
+http://hackage.haskell.org/package/liboleg-2010.1.10.0/docs/Control-CCRef.html
+
+https://hackage.haskell.org/package/CC-delcont-0.2.1.0/candidate/docs/Control-Monad-CC.html
+
+http://www.haskellforall.com/2012/06/you-could-have-invented-free-monads.html
+
+http://www.haskellforall.com/2012/12/the-continuation-monad.html
+
+https://blog.poisson.chat/posts/2019-10-26-reasonable-continuations.html
+
+http://okmij.org/ftp/continuations/implementations.html
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+https://free.cofree.io/2020/01/02/cps/
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+https://maxhallinan.com/posts/2019/10/22/how-does-the-continuation-monad-work/
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+https://github.com/iokasimov/pipeline
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+https://hexagoxel.de/postsforpublish/posts/2018-09-09-cont-part-one.html
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+https://github.com/rain-1/continuations-study-group/wiki/Reading-List
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+http://blog.ielliott.io/continuations-from-the-ground-up/
+
+https://deque.blog/2017/12/08/continuation-passing-style-free-monads-and-direct-style-free-monads/
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+https://vaibhavsagar.com/blog/2017/05/22/discovering-continuations/
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+http://blog.sigfpe.com/2008/12/mother-of-all-monads.html
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+https://github.com/quchen/articles/blob/master/cont_monad.md