Add tasks for all the new languages

Task/Delete-a-file/Lasso/delete-a-file.lasso

@@ -0,0 +1,17 @@
+// delete file
+local(f = file('input.txt'))
+#f->delete
+
+// delete directory
+// directory must be empty before it can be successfully deleted. A failure is generated if the operation fails.
+local(d = dir('docs'))
+#d->delete
+
+// delete file in root file system (requires permissions at user OS level)
+local(f = file('//input.txt'))
+#f->delete
+
+// delete directory in root file system (requires permissions at user OS level)
+// directory must be empty before it can be successfully deleted. A failure is generated if the operation fails.
+local(d = file('//docs'))
+#d->delete