Add Automatic Documentation of `Talawa API` GraphQL Schema

[EshaanAgg]

Is your feature request related to a problem? Please describe. We want to use the Graphql Markdown package to automatically generate markdown documentation for the API's GraphQL schema and add it to the side.

Describe the solution you'd like NA

Describe alternatives you've considered NA

Approach to be followed (optional) NA

Additional context NA

[EshaanAgg]

I would like to work on this issue.

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