Update README.md

[1]. stored-> refresh an instance. [2]. fix: get ref doc from instance [3]. feat: get total-> count()

[1]. disable test api

[1]. model instance-> refresh data from db, [2]. request-> access req.body -> this.body, [3]. fix model field type reference-> get data. [4]. instance.update-> use refresh data to current instance

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[1]. test ref model-> done

[1]. Model-> get data from ref collection

[1]. update readme

[1]. update readme

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[1]. modify get current user auth by email, [2]. add media resource

[1]. modify request register

[1]. write doc

[1]. api user & avatar

[1]. vercel config