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docs: Add README for Day 3 Advent of Code 2024 solution

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docs: Add README.md for Day 3 Advent of Code problem description
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# Day 3: Mull It Over
## Problem Description
The North Pole Toboggan Rental Shop's computers are having issues with corrupted
memory.
The program is trying to multiply numbers but the instructions are jumbled up.
## Rules
- Valid instructions are in the format `mul(X,Y)` where X and Y are 1-3 digit numbers
- Example: `mul(44,46)` multiplies 44 by 46 to get 2024
- Invalid instructions should be ignored, examples:
- `mul(4*`
- `mul(6,9!`
- `?(12,34)`
- `mul ( 2 , 4 )`
## Example
Given the corrupted memory:
```txt
xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))
```
Only these instructions are valid:
- mul(2,4)
- mul(5,5)
- mul(11,8)
- mul(8,5)
```sh
Total = (2*4) + (5*5) + (11*8) + (8*5) = 161
```
## Task
Scan the corrupted memory for valid mul instructions and sum their results.