Initial README

README.md

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+# Advent of Code
+
+In this repository are my Advent of Code solutions.
+
+I don't religiously take part, and tend to bow out before halfway through even
+on the years I do take part. Mostly, it's how I find an excuse to write code in
+a programming language I'm interested in learning more about.
+
+2018, 2019, and 2020 were in their own separate repositories, but have been
+`git subtree`'d into this one - no point creating a new repository every year.
+
+* 2018 - Rust
+* 2019 - Zig
+* 2020 - JavaScript
+* 2021 - Python
+
+I did 2017 in LISP, but don't seem to have kept a copy of the code anywhere.