Add features list into README

[maxpoletaev]

Please, add features list into README.md. I can't understand why do I need this package.

[nunesvictor]

I think the same, I figured out I don't really need it. autocomplete-python get the job done. I just want something to help me with the templates

[Baksalyar]

Same thoughts! I don't understand what this package for and why do i need it.

[zietbukuel]

Same here, I don't even know what this package does besides "building django apps faster", that's a very vague description. The README should definitely be improved.

[maxadamo]

I think, if you make an app it is fair to create a documentation that explains at least:

• how to use the the app
• what it does, what it doesn't
  we don't need to know that we can run apm install <package name> 😄

[zacharytamas]

Added some long overdue documentation for the snippets. A lot has happened in life since I originally started this project. :) Sorry it took so long.