Restore Main.java with warmup assignment and remove Rainfall.java

[Copilot]

Reverts the Main.java → Rainfall.java rename and consolidates assignments. Main.java now contains the warmup revenue/expenses exercise, and Rainfall.java is removed from the branch.

File Changes

• Created Main.java with warmup assignment (revenue/expenses conditional logic exercise)
• Deleted Rainfall.java (removed rainfall assignment from branch)
• Deleted Warmup.java (content moved to Main.java)
• Reverted .clover-tests/MainTest.java and .clover-tests/run-tests.sh to reference Main.java

Current State

// Main.java - warmup exercise
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        System.out.print("Enter revenue: ");
        double revenue = scanner.nextDouble();
        System.out.print("Enter expenses: ");
        double expenses = scanner.nextDouble();
        // TODO: if/else for "in the black" vs "in the red"
    }
}

Note: MainTest.java contains rainfall tests from the original Main.java assignment. Test-code mismatch is expected until rainfall assignment is reintroduced.

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