ac-6 : week-5: create api

[aryan0723]

Issue that this pull request solves

created api through django-rest-framework for department module

Brief description of what is fixed or changed

api created for announcements in department module

Types of changes

Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• [ x ] New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Other (please describe):

Checklist

Put an x in the boxes that apply

• [ x ] My code follows the style guidelines of this project
• [ x ] I have performed a self-review of my own code
• [ x ] I have created new branch for this pull request
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• [ x ] My changes generate no new warnings
• [ x ] My changes does not break the current system and it passes all the current test cases.

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[prajjwalkapoor]

@aryan0723 The change looks good, but currently, we are fetching all the announcements regardless of the users. Maybe we could add some filtrations so users get announcements relevant to them.

[aryan0723]

@prajjwalkapoor yes, also I am thinking of adding more API's for better availability of data