Add Pronic Number (#2867)

* Add Pronic Number

* Update directory

* Add unit tests for Pronic Number implementation

Co-authored-by: github-actions <${GITHUB_ACTOR}@users.noreply.github.com>
Co-authored-by: Andrii Siriak <siryaka@gmail.com>

src/main/java/com/thealgorithms/maths/PronicNumber.java

@@ -0,0 +1,38 @@
+package com.thealgorithms.maths;
+
+/*
+ * Java program for Pronic Number
+ * Pronic Number: A number n is a pronic number if
+ * it is equal to product of two consecutive numbers m and m+1.
+ * Wikipedia: https://en.wikipedia.org/wiki/Pronic_number
+ * 
+ * Author: Akshay Dubey (https://github.com/itsAkshayDubey)
+ * 
+ * */
+
+public class PronicNumber {
+
+	/**
+     * This method checks if the given number is pronic number or non-pronic number
+     *
+     * @param input_number Integer value which is to be checked if is a pronic number or not 
+     * @return true if input number is a pronic number, false otherwise
+     */
+	static boolean isPronic(int input_number) {
+		
+		//Iterating from 0 to input_number
+		for(int i = 0; i <= input_number; i++) {
+			
+			//Checking if product of i and (i+1) is equals input_number
+			if(i * (i+1) == input_number && i != input_number) {
+				
+				//return true if product of i and (i+1) is equals input_number
+				return true;
+			}
+			
+		}
+		
+		//return false if product of i and (i+1) for all values from 0 to input_number is not equals input_number
+		return false;
+	}
+}