Update README.md

java-numbers-2/src/main/java/com/baeldung/lcm/BigIntegerLCM.java

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+package com.baeldung.lcm;
+
+import java.math.BigInteger;
+
+public class BigIntegerLCM {
+
+    public static BigInteger lcm(BigInteger number1, BigInteger number2) {
+        BigInteger gcd = number1.gcd(number2);
+        BigInteger absProduct = number1.multiply(number2).abs();
+        return absProduct.divide(gcd);
+    }
+
+}