Add gitignore and update README

.gitignore

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+*.pyc
+
+.cache/
+
+dist/
+build/
+*.egg-info/

README.md

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-# python_etl
+# Firefox Telemetry Python ETL
 
-Python ETL jobs for Firefox Telemetry to be scheduled on Airflow.
+This repository is a collection of ETL jobs for Firefox Telemetry.
+These will be scheduled over our instance of Airflow.
 
+# Appendix
 This project was created with [cookiecutter-python-etl](https://github.com/harterrt/cookiecutter-python-etl).