add README and LICENSE

README.md

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+# Advent of Code 2021
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+This is my [AoC'20](https://adventofcode.com/2021) project.
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+I'm doing this with a few objectives in mind:
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+1. I'm not looking to impress anyone. I prefer to finish over being neat or clever. I didn't finish in 2019 and want to do better this year.
+2. I'm using rust again. My rust skills were never great, but whatever was there at one point has faded away.
+3. I plan to minimize dependencies. I only want to pull in crates when they'll make an objectively large difference. When I can write simple, small functions instead of pulling in a crate, I will.
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+If you happen to see this and have suggestions on how I can improve my rust, please send them my way!