Add problems for days 1-7

2020/day01/problem

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+# Advent of Code
+
+--- Day 1: Report Repair ---
+
+   After saving Christmas five years in a row, you've decided to take a vacation at a nice
+   resort on a tropical island. Surely, Christmas will go on without you.
+
+   The tropical island has its own currency and is entirely cash-only. The gold coins used
+   there have a little picture of a starfish; the locals just call them stars. None of the
+   currency exchanges seem to have heard of them, but somehow, you'll need to find fifty of
+   these coins by the time you arrive so you can pay the deposit on your room.
+
+   To save your vacation, you need to get all fifty stars by December 25th.
+
+   Collect stars by solving puzzles. Two puzzles will be made available on each day in the
+   Advent calendar; the second puzzle is unlocked when you complete the first. Each puzzle
+   grants one star. Good luck!
+
+   Before you leave, the Elves in accounting just need you to fix your expense report (your
+   puzzle input); apparently, something isn't quite adding up.
+
+   Specifically, they need you to find the two entries that sum to 2020 and then multiply
+   those two numbers together.
+
+   For example, suppose your expense report contained the following:
+
+ 1721
+ 979
+ 366
+ 299
+ 675
+ 1456
+
+   In this list, the two entries that sum to 2020 are 1721 and 299. Multiplying them together
+   produces 1721 * 299 = 514579, so the correct answer is 514579.
+
+   Of course, your expense report is much larger. Find the two entries that sum to 2020; what
+   do you get if you multiply them together?
+
+   Your puzzle answer was 157059.
+
+--- Part Two ---
+
+   The Elves in accounting are thankful for your help; one of them even offers you a starfish
+   coin they had left over from a past vacation. They offer you a second one if you can find
+   three numbers in your expense report that meet the same criteria.
+
+   Using the above example again, the three entries that sum to 2020 are 979, 366, and 675.
+   Multiplying them together produces the answer, 241861950.
+
+   In your expense report, what is the product of the three entries that sum to 2020?
+
+   Your puzzle answer was 165080960.
+
+   Both parts of this puzzle are complete! They provide two gold stars: **
+
+   At this point, you should return to your Advent calendar and try another puzzle.
+
+   If you still want to see it, you can get your puzzle input.
+
+References
+
+   Visible links
+   . https://adventofcode.com/
+   . https://adventofcode.com/2020/about
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+   . https://adventofcode.com/2020/settings
+   . https://adventofcode.com/2020/auth/logout
+   . Advent of Code Supporter
+	https://adventofcode.com/2020/support
+   . https://adventofcode.com/2020
+   . https://adventofcode.com/2020
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+   . https://adventofcode.com/2020/leaderboard
+   . https://adventofcode.com/2020/stats
+   . https://adventofcode.com/2020/sponsors
+   . https://github.com/
+   . https://adventofcode.com/events
+   . https://adventofcode.com/2020
+   . https://adventofcode.com/2020/day/1/input