Add readme.

2016/README.md

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+# Advent of Code 2016
+
+These are my solutions (and (sample) inputs) to the [Advent of Code
+2016](http://adventofcode.com/) challenge.
+
+Since last year I (mostly succesfully) tried to learn Python, I will
+attempt to learn Rust in this year's edition.
+
+Feel free to be inspired by this repository, but for the sake of the
+challenge try to solve the exercises yourself first. I make no claims
+that these programs work for all inputs (as I only test them for my own,
+obviously) but they should be mostly correct.
+
+I'm using Rust 1.13.0, but I don't think I make use of the newer parts
+of the standard, so older versions may work.
+
+The program in the repository can be run using the makefile, just run
+`make test` and all the solutions will be run on their input files.

README.md

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+# Advent of Code
+
+This repository contains my solutions for Advent of Code. See:
+
+- [2015 edition](./2015)
+- [2016 edition](./2016)