Update README.md

java-dates/src/main/java/com/baeldung/datetime/UsePeriod.java

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+package com.baeldung.datetime;
+
+import java.time.LocalDate;
+import java.time.Period;
+
+class UsePeriod {
+
+    LocalDate modifyDates(LocalDate localDate, Period period) {
+        return localDate.plus(period);
+    }
+
+    Period getDifferenceBetweenDates(LocalDate localDate1, LocalDate localDate2) {
+        return Period.between(localDate1, localDate2);
+    }
+}