Add code for pyramid word

PyramidWord.iml

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+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4" />

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>com.pyramid</groupId>
+    <artifactId>PyramidWord</artifactId>
+    <version>1.0-SNAPSHOT</version>
+
+    <properties>
+        <maven.compiler.source>1.5</maven.compiler.source>
+        <maven.compiler.target>1.5</maven.compiler.target>
+    </properties>
+</project>

src/main/java/com/pyramid/PyramidWord.java

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+package com.pyramid;
+
+import java.util.*;
+
+public class PyramidWord {
+
+    //checks if a input string is a pyramid word
+    //Returns "true" if the input string is a pyramid word else false
+    static boolean checkPyramid(String str) {
+
+        //check if string length is 1
+        if(str.length() == 1)
+            return true;
+
+        //Move each character from the input string and it's frequency to a hash map
+        HashMap<Character,Integer> m = new HashMap<Character, Integer>();
+        for(int i=0;i< str.length();i++) {
+            if(m.containsKey(str.charAt(i))) {
+                m.put(str.charAt(i), m.get(str.charAt(i)) + 1);
+            }
+            else {
+                m.put(str.charAt(i), 1);
+            }
+        }
+
+        //Sort the Hash Map based on frequencies
+        List<Map.Entry<Character,Integer>> entryList = new LinkedList<Map.Entry<Character, Integer>>(m.entrySet());
+        Collections.sort(entryList, new Comparator<Map.Entry<Character, Integer>>() {
+            public int compare(Map.Entry<Character, Integer> o1, Map.Entry<Character, Integer> o2) {
+                return o1.getValue().compareTo(o2.getValue());
+            }
+        });
+
+        //Check for increasing frequencies
+        int count=2;
+        for(Map.Entry<Character,Integer> map: entryList) {
+            if(map.getValue()+1 == count) {
+                count++;
+            }
+            else
+                return false;
+        }
+
+        return true;
+    }
+
+    public static void main(String[] args) {
+        //enter an input string
+        Scanner sc = new Scanner(System.in);
+        String input = sc.nextLine();
+
+        if(checkPyramid(input))
+            System.out.println("Word is a pyramid word");
+        else
+            System.out.println("Word is not a pyramid word");
+    }
+}