All you have to do is actually to copy the above JSON and paste it directly into n8n. It will then create everything for you and it should work.
Because in the last version there were some breaking changes it is actually best if you update n8n to the latest version first (0.67.0) and then copy this slightly changed workflow instead:
Yep2, i copied and it worked. Sorry for not mentioning it in the previous message.
“Do you have anything to suggest?” it means i want to try different workflow like github star in rocketchat. Maybe you can suggest me to try different automations.
Ah now I understand. You can find some example workflows here:
https://n8n.io/workflows
Additionally some tutorials here:
Thank you for support! 
Sure you are welcome! Have fun!