add readme and license

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org>
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+# CIS194 - Haskell Course from University of Pennsylvania
+
+This repository contains notes and code I wrote while following [CIS194](https://www.seas.upenn.edu/~cis1940/spring13/lectures.html), a Haskell course from University of Pennsylvania.
+
+The repository is structured in lectures. Every directory of the form `lecN` (where `N` is a two-digit number, `lec01`, `lec02`, etc.) in the repository's root is a lecture and it coincides exactly with a week of the course. Inside of each lecture directory there are my notes about it, homework given for that week, and possibly some other files given as part of the homework. My notes contain what I deem to be the most important concepts of the lecture, written as I'd write them if I had to explain the concepts to a friend.
+
+---
+
+All my notes and code are licensed through the [Unlicense license](https://unlicense.org/) and, therefore, they are released into the [public domain](https://en.wikipedia.org/wiki/Public_domain).