Improve passing env variables

README.md

@@ -10,11 +10,19 @@ SCRAPER_SMTP_PASSWORD
 SCRAPER_TO_MAIL
 ```
 
+You can define them in shell or make use of .env.example file and copy it to `.env` (the docker example uses that approach)
+
 It uses Google SMTP server (you have to provide google app credentials).
 
 
 Run with:
-
 ```
 python main.py
+```
+
+or build docker image and run it using the docker:
+
+```
+docker build -t lidl-price-scraper .
+docker run -it --rm  --env-file ./.env lidl-price-scraper
 ```