Add code for 2020 day 6.

day_6/info.md

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+https://adventofcode.com/2020/day/6

day_6/part_1.py

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+with open("data") as f:
+	plane = f.read()
+
+
+plane = plane.split("\n\n")
+
+count = 0
+for group in plane:
+	group_answers = []
+	for person in group.split("\n"):
+		for q in person:
+			if q not in group_answers:
+				group_answers.append(q)
+	count += len(group_answers)
+
+print(count)

day_6/part_2.py

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+with open("data") as f:
+	plane = f.read()
+
+
+plane = plane.split("\n\n")
+
+count = 0
+for group in plane:
+	group_size = len(group.split("\n"))
+	group_answers = {}
+	for person in group.split("\n"):
+		for q in person:
+			if q not in group_answers:
+				group_answers[q] = 1
+			else:
+				group_answers[q] += 1
+	count += len([1 for v in group_answers.values() if v == group_size])
+
+print(count)