Added time.sleep function

examples/thread/thread.q

@@ -1,5 +1,6 @@
 import sys
 import thread
+import time
 
 main() {
 	thread.create(work)
@@ -10,6 +11,7 @@ main() {
 
 work() {
 	sys.write(1, "[ ] start\n", 10)
+	time.sleep(10 * 1000 * 1000)
 	sys.write(1, "[x] end\n", 8)
 	sys.exit(0)
 }