add some comment

[LuckyPigeon]

I'm new to this project, and I'm still trying to understand how this work, but it's seems there are less comment in the PyBeacon.py, so I decided to add some comment beside the code, so that when other new come to contribute, they can understand the code faster and quickly get involved.

[PrabhanshuAttri]

@LuckyPigoen It's a good suggestion. Please go ahead and add comments to PyBeacon/PyBeacon.py. Please do make sure that you follow pep-8 guidelines.

[LuckyPigeon]

I find that at PyBeacon.py line 88, there's a indent wrong, the "else" is four space less that the "if". Do I need to create another issue, or just fix it and PR?

[PrabhanshuAttri]

@LuckyPigeon Fix it and create a PR.