added cron_sample

README.md

@@ -57,7 +57,7 @@ The actual updates to leaderboard will happen only via `background_runner.py` pr
 
 **Scheduling leaderboard updates**
 
-Instead of running the `background_runner.py` manually, the program can be scheduled at regular intervals or specified time using utilities like **crontab**. Look at the cron_sample for an example.
+Instead of running the `background_runner.py` manually, the program can be scheduled at regular intervals or specified time using utilities like **crontab**. Look at the `cron_sample` for an example.
 
 
 Contributors

cron_sample

+# run background_process.py eveyr two hours once.
+* */2 * * * cd absolute-path-to-osm-leaderboard/ && python3.6 absolute-path-to-osm-leaderboard/background_runner.py