Add B_MapCelsiusToFahrenheit.java

Author: ZahidFKhan

src/test/java/com/github/streams/practice/a_easy/numbers/problems/A_FilterCountEvenNumbers.java renamed to src/test/java/com/github/streams/practice/a_easy/numbers/problems/A_CountEvenNumbers.java

@@ -14,7 +14,7 @@
  * Output = 3 <br>
  * Explanation: (1, 2, 3) are even numbers.
  */
-class A_FilterCountEvenNumbers {
+class A_CountEvenNumbers {
 
   @Test
   @Disabled