Added haskell README

haskell/README.md

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+<p align = "center">
+<img src="https://raw.githubusercontent.com/devicons/devicon/master/icons/haskell/haskell-original.svg" alt="Haskell" width="200"/>
+</p>
+
+# Introduction
+After miserably failing my Functional Programming exam and some soul searching, I realized that I never really learned Haskell nor did I ever really understand functional programming. So, I decided to learn Haskell properly. This repository will document my journey in learning Haskell.
+
+With the help of some friends!
+
+This is going to be structured in a different way than my other repositories. I will have a `sessions` folder where I will document my thought process and the things I learned while during my "lessons". Maybe do Haskell notebooks? I don't know yet.
+
+This is the larger, more general README, which will house the main takeaways/revelations of the sessions.
+
+## ToC
+- [Introduction](#introduction)
+  - [ToC](#toc)
+- [Books and resources](#books-and-resources)
+  - [13th of March - Introduction](#13th-of-march---introduction)
+
+# Books and resources
+- [Haskell Programming from first principles](http://haskellbook.com/)
+- [Learn you a Haskell for great good](http://learnyouahaskell.com/)
+
+
+## [13th of March - Introduction](sessions/13_03/notes.md)
+
+Big question:
+
+> Why is the singly-linked list the most common data structure in functional programming?
+
+Because it is the simplest recursive data structure. It is a recursive data structure because it is defined in terms of itself. It is a singly-linked list because it has a head and a tail. The head is the first element of the list and the tail is the rest of the list.
+
+<p align="center">
+    <img src="assets/list.png" alt="lists" width="700"/>
+</p>
+
+> But why not a tree?
+
+The tree is simply too complex. Linked lists are easy.
+