Add .gitignore to ignore non-source code files

Author: osantana

.gitignore

@@ -0,0 +1,18 @@
+__pycache__/
+*.py[cod]
+*$py.class
+*.so
+.Python
+build/
+dist/
+downloads/
+eggs/
+.eggs/
+*.egg-info/
+*.egg
+*.log
+docs/_build/
+.python-version
+.env
+.venv
+env/