update README

Author: nickdark

raspberry_pi_locator/README.md

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+# raspberry-pi-webscraping
+
+A simple Python script to check popular Raspberry PI-certified shops for availability of Model 4s.
+
+## Setup instructions
+
+Simply install dependencies (ideally in a virtual environment):
+
+```shell
+python -m venv venv
+source /venv/bin/activate
+pip install -r requirements.txt
+```
+
+and then run the script:
+```shell
+python main.py
+```
+
+## Output
+
+The script returns formatted terminal output with URL links to the located Raspberry PIs if any were found.
+
+## Author(s)
+
+Nicholas Prieto