if you want import this project, following steps:
1: access Dialogflow
2: login with your gmail.
3: create new agent named "home"
4: click Setting -> Export and Import -> Import from zip -> Choose file HomeAutomation.zip -> Import
5: Open file Fulfillment_code_for_HomeAutomation.js -> copy all -> click Fulfillment in your agent -> paste to Inline editor
6: Click deploy
7: Embed code in file connect_to_Firebase.ino into ESP8266
8: From Dialogflow tab, click Integrations -> Google Assitant -> TEST
9: Done @@