add readme, add sample data for day1 day2, completed solution for day4a

2021/day4/4a.py

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+lines = open("input.txt", 'r').read().splitlines()
+draw = [int(i) for i in lines[0].split(",")]
+boards = []
+for s in range(2, len(lines),6):
+	boards.append([[int(j) for j in lines[i].split()] for i in range(s,s+5)])
+
+earliestWin = len(draw)
+winBoard = 0
+
+for b in range(0, len(boards)):
+	for i in range(0, 5):
+		latest = 0
+		for j in range(0, 5):
+			if boards[b][i][j] not in draw:
+				break
+			index = draw.index(boards[b][i][j])
+			if index > latest:
+				latest = index 
+		if latest < earliestWin and latest != 0:
+			earliestWin = latest
+			winBoard = int(b)
+		latest = 0
+		for j in range(0, 5):
+			if boards[b][j][i] not in draw:
+				break
+			index = draw.index(boards[b][j][i])
+			if index > latest:
+				latest = index 
+		if latest < earliestWin and latest != 0:
+			earliestWin = latest
+			winBoard = b
+
+summa = 0
+for row in boards[winBoard]:
+	for n in row:
+		if n not in draw[:earliestWin+1]:
+			summa += n
+
+print(draw[earliestWin]*summa)

README.md

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+my solutions for the [Advent of Code](https://adventofcode.com/)
+
+in progress:
+2021 (python)
+
+planned:
+2022 (swift)
+2020 (rust?)
+2019
+2018
+2017
+2016
+2015