From 556606422ada85d1f9c642f426b6bd2129f9d79e Mon Sep 17 00:00:00 2001
From: Tunahan Turker Erturk <89503561+tunisch@users.noreply.github.com>
Date: Tue, 30 Dec 2025 23:03:24 +0300
Subject: [PATCH] Document stack data structure and its methods

Added an explanation of the stack data structure with methods and references.
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+# Stack
+- Stack,LIFO (Last in First out) (En son giren en once cikar) mantigina dayanan ,elemanlar toplulugundan olusan bir yapidir. Ornek olarak, Tasinirken topladiginiz koli kutusu dusunun. Icerisinde kitaplar var ve en, boy olarak koliye koyuluyor. Mantiken kolinin alti kapali ve ust uste koymamiz gerekmektedir. Yeni tasindiginiz yerde cikartirken en ustekinden baslarsiniz. Iste Stack(yigin) da ayni mantikla calisiyor.
+- Yiginlara eleman eklerken veya cikartirken bazi methodlar uygulanir. Bunlardan biri push, digeri ise pop. Push, yiginin uzerine eleman eklemek icin kullanilir.(Koliye kitap koymak).Pop ise, yigindan eleman cikarmak icin kullanilir.
+
+<img width="518" height="431" alt="image" src="https://github.com/user-attachments/assets/42c1d965-6cb6-4223-a360-7f4095d9febe" />
+
+## References:
+
+1. [stack-kod-örneği](http://www.baskent.edu.tr/~tkaracay/etudio/ders/prg/dataStructures/Collections/ClassStack.pdf)
+2. [stack-detaylı-anlatım](https://cdn-acikogretim.istanbul.edu.tr/auzefcontent/20_21_Guz/veri_yapilari/6/index.html)
+3. [stack-short-defition](https://runestone.academy/runestone/books/published/pythonds/BasicDS/WhatisaStack.html)
+4. [stack-defition-with-code](https://www.studytonight.com/data-structures/stack-data-structure)