refactor and add CURD to organization model

[TejasNair9977]

new Schema:

parent: Organization

name: str

startDate: date

accreditation: Accreditation

create the following function for the organization model:

• create
• update
• read
• remove

use user.js for reference

[KAUSTUBHDUBEY790]

@TejasNair9977 hey assign me the issue i want to work on this