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feat: Add README.md for Day 2 Advent of Code 2024 challenge

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# Day 2: Red-Nosed Reports
## Problem Description
The engineers at the Red-Nosed Reindeer nuclear fusion/fission plant need help analyzing
unusual data from their reactor. The data consists of reports, with each report containing
a list of numbers called levels.
### Rules for Safe Reports
A report is considered safe if it meets both of these criteria:
1. The levels are either all increasing or all decreasing
2. Any two adjacent levels differ by at least one and at most three
### Example
```csv
7 6 4 2 1 # Safe (all decreasing by 1 or 2)
1 2 7 8 9 # Unsafe (2->7 increases by 5)
9 7 6 2 1 # Unsafe (6->2 decreases by 4)
1 3 2 4 5 # Unsafe (increasing then decreasing)
8 6 4 4 1 # Unsafe (4->4 no change)
1 3 6 7 9 # Safe (all increasing by 1-3)
```
### Part 1 Challenge
Count how many reports in the input data are safe according to the rules above.
### Input Format
Each line contains space-separated integers representing the levels in a report.
### Example Solution
In the example above, 2 reports are safe.