Initial data commit

Task/Hello-world-Text/Sisal/hello-world-text.sisal

@@ -0,0 +1,10 @@
+define main
+
+% Sisal doesn't yet have a string built-in.
+% Let's define one as an array of characters.
+
+type string = array[character];
+
+function main(returns string)
+  "Hello world!"
+end function