Merge pull request #270 from rwtolbert/examples_delay

add examples for delay

Author: sogaiu

examples/delay.janet

@@ -0,0 +1,11 @@
+(def setup-once
+  (let [setup |(print "running setup")]
+    (delay
+     (setup)
+     "setup complete")))
+
+# first run will print "running setup" followed by "setup complete"
+(printf "first run: %s" (setup-once))
+
+# after that, only prints cached value "setup complete"
+(printf "second run: %s" (setup-once))