feat: add Truck, Bulldozer and Excavator machine class

[vadym-bondar-g]

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[mateacademy-ai-mentor]

Review Summary

I am requesting changes because the core task requirements and abstraction are not implemented yet, so the solution cannot function as specified. The Machine class (e.g., src/main/java/core/basesyntax/Machine.java) must be declared abstract and include public abstract void doWork() and public abstract void stopWork(); right now it is a concrete, empty class, which breaks the main OOP requirement [CHECKLIST ITEM #4]. Then, Truck, Bulldozer, and Excavator (in their respective files) need to extend Machine and override doWork()/stopWork() to print clear English messages such as Bulldozer started working and Bulldozer stopped working, so that each machine type is identifiable in the output [CHECKLIST ITEM #2]. You also need to add a MainApp class that creates a Machine[] containing instances of Truck, Bulldozer, and Excavator, and uses a loop to call doWork() and stopWork() on each element via Machine references, demonstrating polymorphism as required [CHECKLIST ITEM #3]. Once these pieces are in place, you can review access modifiers (e.g., keep methods public) and maintain clean formatting, but those are secondary to getting the core behavior working. You’ve created the basic class files, which is a good start—finishing the abstract class, inheritance, and main logic will complete the exercise and meet all the key requirements.

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