Initial skeleton code for 2020

2020/README.md

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+# Advent of Code 2020
+
+This folder contains a runner script for Advent of Code 2020. This year, I'm
+attempting to solve every problem once more in Rust.
+
+```
+aoc-2020
+Advent of Code 2020 runner
+
+USAGE:
+    aoc-2020 [FLAGS] [OPTIONS] <day>
+
+ARGS:
+    <day>    Which day to run
+
+FLAGS:
+    -h, --help       Prints help information
+    -2, --part2      Run part 2 instead of part 1
+    -t, --time       Print time taken
+    -V, --version    Prints version information
+
+OPTIONS:
+    -i, --input <input>    Read input from the given file instead of stdin
+```