Added .crf to every sample-program

sample-programs/basic-8.crf

@@ -0,0 +1,24 @@
+data Maybe (a) where {
+    Nothing : Maybe (a)
+    Just : a -> Maybe (a)
+};
+
+fromJust : Maybe (a) -> a ;
+fromJust a =
+    case a of {
+        Just a => a
+    };
+
+fromMaybe : a -> Maybe (a) -> a ;
+fromMaybe a b =
+    case b of {
+        Just a => a;
+        Nothing => a
+    };
+
+maybe : b -> (a -> b) -> Maybe (a) -> b;
+maybe b f ma =
+    case ma of {
+        Just a => f a;
+        Nothing => b
+    }