Merge pull request #359 from ricemery/gigasecond

Add file with expected interface. Refs #137

Author: ErikSchierboom

exercises/gigasecond/src/main/scala/Gigasecond.scala

@@ -0,0 +1,8 @@
+import java.time.LocalDate
+import java.time.LocalDateTime
+
+object Gigasecond {
+  def addGigaseconds(startDate: LocalDate): LocalDateTime = ???
+
+  def addGigaseconds(startDateTime: LocalDateTime): LocalDateTime = ???
+}