chore: add all problems as READMEs

day5/README.md

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+## \--- Day 5: Supply Stacks ---
+
+The expedition can depart as soon as the final supplies have been unloaded from the ships. Supplies are stored in stacks of marked _crates_, but because the needed supplies are buried under many other crates, the crates need to be rearranged.
+
+The ship has a _giant cargo crane_ capable of moving crates between stacks. To ensure none of the crates get crushed or fall over, the crane operator will rearrange them in a series of carefully-planned steps. After the crates are rearranged, the desired crates will be at the top of each stack.
+
+The Elves don't want to interrupt the crane operator during this delicate procedure, but they forgot to ask her _which_ crate will end up where, and they want to be ready to unload them as soon as possible so they can embark.
+
+They do, however, have a drawing of the starting stacks of crates _and_ the rearrangement procedure (your puzzle input). For example:
+
+        [D]
+    [N] [C]
+    [Z] [M] [P]
+     1   2   3
+
+    move 1 from 2 to 1
+    move 3 from 1 to 3
+    move 2 from 2 to 1
+    move 1 from 1 to 2
+
+In this example, there are three stacks of crates. Stack 1 contains two crates: crate `Z` is on the bottom, and crate `N` is on top. Stack 2 contains three crates; from bottom to top, they are crates `M`, `C`, and `D`. Finally, stack 3 contains a single crate, `P`.
+
+Then, the rearrangement procedure is given. In each step of the procedure, a quantity of crates is moved from one stack to a different stack. In the first step of the above rearrangement procedure, one crate is moved from stack 2 to stack 1, resulting in this configuration:
+
+    [D]
+    [N] [C]
+    [Z] [M] [P]
+     1   2   3
+
+In the second step, three crates are moved from stack 1 to stack 3. Crates are moved _one at a time_, so the first crate to be moved (`D`) ends up below the second and third crates:
+
+            [Z]
+            [N]
+        [C] [D]
+        [M] [P]
+     1   2   3
+
+Then, both crates are moved from stack 2 to stack 1. Again, because crates are moved _one at a time_, crate `C` ends up below crate `M`:
+
+            [Z]
+            [N]
+    [M]     [D]
+    [C]     [P]
+     1   2   3
+
+Finally, one crate is moved from stack 1 to stack 2:
+
+            [Z]
+            [N]
+            [D]
+    [C] [M] [P]
+     1   2   3
+
+The Elves just need to know _which crate will end up on top of each stack_; in this example, the top crates are `C` in stack 1, `M` in stack 2, and `Z` in stack 3, so you should combine these together and give the Elves the message `CMZ`.
+
+_After the rearrangement procedure completes, what crate ends up on top of each stack?_
+
+Your puzzle answer was `TWSGQHNHL`.
+
+## \--- Part Two ---
+
+As you watch the crane operator expertly rearrange the crates, you notice the process isn't following your prediction.
+
+Some mud was covering the writing on the side of the crane, and you quickly wipe it away. The crane isn't a CrateMover 9000 - it's a _CrateMover 9001_.
+
+The CrateMover 9001 is notable for many new and exciting features: air conditioning, leather seats, an extra cup holder, and _the ability to pick up and move multiple crates at once_.
+
+Again considering the example above, the crates begin in the same configuration:
+
+        [D]
+    [N] [C]
+    [Z] [M] [P]
+     1   2   3
+
+Moving a single crate from stack 2 to stack 1 behaves the same as before:
+
+    [D]
+    [N] [C]
+    [Z] [M] [P]
+     1   2   3
+
+However, the action of moving three crates from stack 1 to stack 3 means that those three moved crates _stay in the same order_, resulting in this new configuration:
+
+            [D]
+            [N]
+        [C] [Z]
+        [M] [P]
+     1   2   3
+
+Next, as both crates are moved from stack 2 to stack 1, they _retain their order_ as well:
+
+            [D]
+            [N]
+    [C]     [Z]
+    [M]     [P]
+     1   2   3
+
+Finally, a single crate is still moved from stack 1 to stack 2, but now it's crate `C` that gets moved:
+
+            [D]
+            [N]
+            [Z]
+    [M] [C] [P]
+     1   2   3
+
+In this example, the CrateMover 9001 has put the crates in a totally different order: `MCD`.
+
+Before the rearrangement process finishes, update your simulation so that the Elves know where they should stand to be ready to unload the final supplies. _After the rearrangement procedure completes, what crate ends up on top of each stack?_
+
+Your puzzle answer was `JNRSCDWPP`.
+
+Both parts of this puzzle are complete! They provide two gold stars: \*\*