Add readme and final improvements

README.md

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+# Lidl price scraper
+
+Simple app which checks a price of selected items and prints their current price and discount.
+
+It also sends a notification of items via email any items is on sale and following env variables are defined:
+
+```
+SCRAPER_SMTP_USER
+SCRAPER_SMTP_PASSWORD
+SCRAPER_SMTP_USER
+```
+
+It uses Google SMTP server (you have to provide google app credentials).
+
+
+Run with:
+
+```
+python scrape.py
+```