move 2021 days to folder; update README

README.md

@@ -1,5 +1,13 @@
 # advent-of-code
 
-My Advent of Code answers, for 2021.
+My Advent of Code answers!
+
+**2022:**
+
+Scheme (either MIT-Scheme or Gambit) will most likely be my first choice. Forth is a runner-up, but probably too much to stick with.
+
+Day 1 will be attempted on an Apple ][ GS, using Applesoft BASIC.
+
+**2021:** Nearly all challenges were done in Clojure. I used C++ for a couple of the more challenging ones, and tried Maxima on a part too.
+**2020:** Incomplete, just tried a day in Clojure.
 
-Written in whatever language I feel like, likely Clojure or C++.