Adding questions

Readme.md

+Write the implementaion for the method which takes a positive (or zero) integer value and converts it into a binary equivalent without using any Math library.
+However, if the input argument is negative, it should throw some exception as so far it doesn't still supports 
+to convert the negative number into binary. 
+
+
+Sample Input:  if a given number is <b>35</b>, the method should return <b>100011</b> 
+
+
+write your code under <b> src/main/java/exam/ConvertToBinary#toBinary() - (3) Marks.</b> method
+
+----------------
+
+Write the implementation of a method which takes an integer array and it shifts all the elements to one right 
+however the last element would be placed at the first position as it cannot go further right in the same array and hence goes to first place.
+No new array needs to be created, the operation should be performed in the same array.
+
+e.g. if the array input is <b>1,2,3,4,5</b>
+then the implementation of shift method should shift the element and also the last element (5) should come to the first place 
+and hence the final output should be <b>5,1,2,3,4</b> 
+
+write your code under <b> src/main/java/exam/ShiftElementsInArray#shift() - (3) Marks.</b> method
+
+----------------
+
+
 For a given total (T), and a weight (w) find the number of combinations where total T can be achieved by summing up
 all the weights range from 1 to w.
 
@@ -18,4 +43,11 @@ all the weights range from 1 to w.
 
 `2,3`
 
-write your code under <b> exam.CountCombinations#getNumberOfWays() </b> method
+write your code under <b> src/main/java/exam/CountCombinations#getNumberOfWays() - (4) Marks.</b> method
\ No newline at end of file
+
+
+
+-----
+
+<b><i>For any of the above questions, donot change the signature of the provided methods, 
+just write your code inside the give methods as mentioned in each question!</i></b>
\ No newline at end of file

src/main/java/exam/ConvertToBinary.java

+package exam;
+
+public class ConvertToBinary {
+
+  public String toBinary(final int n) {
+    //TODO write your code here to achieve the desired result as explained in Readme file for this problem.
+    return "";
+  }
+}

src/main/java/exam/ShiftElementsInArray.java

+package exam;
+
+public class ShiftElementsInArray {
+
+  public void shift(int[] arr) {
+    //TODO write your code here to achieve the desired result as explained in Readme file for this problem.
+
+  }
+
+}