Add dockerfile and fix readme

Dockerfile

@@ -0,0 +1,10 @@
+FROM python:3.9-slim
+
+WORKDIR /app
+
+COPY . /app
+
+RUN pip install --no-cache-dir -r /app/requirements.txt
+
+# Run app.py when the container launches
+CMD ["python", "/app/main.py"]

README.md

@@ -7,7 +7,7 @@ It also sends a notification of items via email any items is on sale and followi
 ```
 SCRAPER_SMTP_USER
 SCRAPER_SMTP_PASSWORD
-SCRAPER_SMTP_USER
+SCRAPER_TO_MAIL
 ```
 
 It uses Google SMTP server (you have to provide google app credentials).
@@ -16,5 +16,5 @@ It uses Google SMTP server (you have to provide google app credentials).
 Run with:
 
 ```
-python scrape.py
+python main.py
 ```

main.py

@@ -52,4 +52,4 @@ if __name__ == "__main__":
 
     if len(products_on_sale) > 0:
         sender = EmailSender(os.environ["SCRAPER_SMTP_USER"], os.environ["SCRAPER_SMTP_PASSWORD"])
-        sender.send_email(os.environ["SCRAPER_SMTP_USER"], products_on_sale)
+        sender.send_email(os.environ["SCRAPER_TO_MAIL"], products_on_sale)