add LICENSE and README.md

LICENSE

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+Copyright 2020 Stephen Waits <steve@waits.net>
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the “Software”), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# Advent of Code 2020
+
+This is my [AoC'20](https://adventofcode.com/2020) project.
+
+I'm doing this with a few objectives in mind:
+
+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.
+
+If you happen to see this and have suggestions on how I can improve my rust, please send them my way!