add at and hibye examples

examples/at.lamb

@@ -0,0 +1,15 @@
+-- at (indexer) function, for lists and strings
+
+-- out of values (hey, this isn't the Circus of Values!)
+at([], _) -> -1.
+at("", _) -> -1.
+
+-- we've hit our target item
+at(x::_, 0) -> x.
+
+-- we've got more to go, keep iterating
+at(x::xs, i) -> at(xs, i-1).
+
+-- test
+print(at([1, 2, 3, 4], 2)).
+print(at("hi there", 1)).

examples/hibye.lamb

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+-- demonstrates string patterns
+
+f("hi") -> "hello to you too!".
+f("bye") -> "goodbye!".
+
+putstrln(f("hi")).
+putstrln(f("bye")).