Added Goldbach's Conjecture algorithm.

Author: BILLSARAN

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

@@ -24,8 +24,7 @@ private static boolean isPrime(int n) {
         int i;
         if (n <= 1 || (n % 2 == 0 && n != 2)) {
             return false;
-        }
-        else {
+        } else {
             for (i = 3; i < Math.sqrt(n); i += 2) {
                 if (n % i == 0) {
                     return false;