Add 011_containerwithmostwater (qiyuangong#13)

Add 011_containerwithmostwater Java solution by @arun-aditya

Author: arun-aditya

java/011_containerwithmostwater.java

@@ -0,0 +1,20 @@
+class Solution {
+    public int maxArea(int[] height) {
+ 
+        int max=0;
+        int left=0;
+        int right=height.length-1;
+        
+        while(left<right){
+            max=Math.max(max, (right-left) * Math.min(height[left],height[right]));
+            if(height[left]< height[right]){
+                left++;
+            }
+            else{
+                right--;
+            }
+        }
+        
+        return max;
+    }
+}