Create README.md

Author: detelinka

README.md

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+# CHEAT SHEET
+
+## Stacks & Queues / Стекове и Опашки
+```java
+### Stack - LIFO - First in First Out
+Deque<Integer> stack = new ArrayDeque<>();
+push(element) - insert element on the top of the stack
+pop() - remove topmost element
+peek() - get topmost element
+
+### Queue - FIFO - First in First out
+Deque<Integer> queue = new ArrayDeque<>();
+offer(element) - add element at the start of the Queue
+poll() - remove first element of the Queue
+peek() - get first element of the Queue
+
+### PriorityQueue
+PriorityQueue<String> fruits = new PriorityQueue<>();
+- нарежда ги по азбучен ред или по големина
+
+while (!queue.isEmpty()){
+   Integer element = queue.poll();
+   System.out.println(element);
+} - принтира всичките елементи (важи и за опашките)
+
+******** important *********       
+add() – throws exception if queue is full
+offer()– returns false if a queue is full
+remove()-throws exception if queue is empty
+poll()-returns null if queue is empty
+  
+```
+## Multidimensional Arrays / Многомерни масиви - матрици