Adding day 18 p1 and 19 p1 + creating folder 2018

2018/day1/part1.scala

@@ -0,0 +1,12 @@
+/**
+ * Usage: scala part1.scala < input
+ */
+
+import scala.io.StdIn
+import scala.collection.Iterator
+
+println(Iterator
+  .continually(StdIn.readLine)
+  .takeWhile(_ != null)
+  .map(Integer.parseInt)
+  .sum)