Update README and references

2022/README.md

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+# Advent of Code 2022
+
+Another year and another Advent of Code in Rust. Because last year went so well, this time we'll be
+aiming for a total time of under 250ms.
+
+```console
+$ target/release/aoc_2022 --help
+Advent of Code 2022 runner
+
+Usage: aoc_2022 [OPTIONS] <DAY>
+
+Arguments:
+  <DAY>  Which day to run
+
+Options:
+  -t, --time           Print time taken
+  -2, --part2          Run part 2 instead of part 1
+  -i, --input <INPUT>  Read input from the given file instead of stdin
+  -h, --help           Print help information
+```