first commit with submodules of the previous years and six days of 2022

.gitmodules

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+[submodule "aoc2020"]
+	path = aoc2020
+	url = https://github.com/metya/advents_of_code
+[submodule "aoc2021"]
+	path = aoc2021
+	url = https://github.com/metya/aoc2021

aoc2020

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+Subproject commit ee7420673b511cf08aa1d8ee788ae33bc5a3b9ed

aoc2021

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+Subproject commit 08077898398d40670e3cb8d5d88448ea23cc972f