Add console entry point for pipx support

Adds support for pipx with console entry point.

closes #702

docs/CONTRIBUTING.md

@@ -51,7 +51,7 @@ $ python3 -m pip install -e .
 
 Then, you can run the program from anywhere in your disk as such:
 ```bash
-$ python3 -m bdfr
+bdfr
 ```
 
 ## Style Guide