Add File Input Output in Wren (#4388)

Author: Kaamkiya

archive/w/wren/file-input-output.wren

@@ -0,0 +1,7 @@
+import "io" for File
+
+File.create("output.txt") {|f|
+  f.writeBytes("My brain has too many tabs open.")
+}
+
+System.print(File.read("output.txt"))