Add program to determine days in a month

[NachoOFC]

No description provided.

[Copilot]

🔵 Needs a closer look

February leap-year handling or an explicit non-leap-year contract is still needed.

Pull request overview

Adds a standalone Java console program that determines the number of days in a selected month.

Changes:

• Reads a month number from standard input.
• Handles 30-day, 31-day, February, and invalid month cases.

File summaries

File	Summary
dias_mes.java	Implements month validation and day-count selection. February is hard-coded to 28, which is incorrect for leap years; accept a year or state the non-leap-year assumption explicitly.

Review details

Suppressed comments (1)

dias_mes.java:18

• February is hard-coded to 28, so this program reports the wrong number of days for February in leap years. Since the input only identifies the month, please either accept a year and apply the leap-year rule, or make the non-leap-year assumption explicit in the program's contract/output.

                dias = 28; // Ignorando años bisiestos para simplicidad

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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