Fill out README

README.md

@@ -1,3 +1,31 @@
-# aoc2022
+# Advent of Code 2022
 
-Advent of Code 2022
+This is my first AoC.
+
+## Languages
+
+I'll try to achieve all challenges using only **Haskell** and **Zig**.
+
+## Running
+
+If
+
+* the respective toolchains are installed,
+* the respective dependencies are installed,
+* and either
+	* an input.txt file is placed in the day's folder, or
+	* an AoC session cookie header is placed in `$HOME/creds/aoc-cookie` (With `Cookie: session=...`),
+
+all challenges can be easily run from the top directory using
+
+```sh
+make DAY=<day>
+```
+
+If the session cookie is saved as described above and no input file exists, it will be pulled from the aoc servers for you.
+
+Afterwards, Make will use either GHC's `runhaskell` or Zig's `zig run` to run the code (with instant compilation) and feed the input to it on STDIN. The results will be printed to STDOUT to be pasted in the AoC web app.
+
+## Licensing
+
+All code licensed under GPLv3, see LICENSE.