Added Django Snippets

[Ali-Aref]

Added Django Snippets on frameworks directory under these 5 files:
1- models: all django models related snippets
2- forms: all django forms related snippets
3- views: all django views related snippets
4- imports: some important django import snippets
5- file-templates: django file template snippets

these snippets almost cover all django snippets.

[rafamadriz]

Hey thanks for contributing!

There's one small change needed, in package.json instead of python as a language, put django. The reason is that not everyone uses django. Adding more snippets to a certain filetype is explained in README in case anyone wants to expand django snippets. For more info see #88 where this was discussed.

[Ali-Aref]

Thanks, All set and now it's fixed. 😊