Add Parse ObjC migration guide

[mtrezza]

New Feature / Enhancement Checklist

• I am not disclosing a vulnerability.
• I am not just asking a question.
• I have searched through existing issues.

Current Limitation

Developers are repeatedly asking questions related to the migration from the Parse ObjC SDK. There is currently no central migration guide that collects all migration related FAQs.

Feature / Enhancement Description

Add migration guide.

Example Use Case

n/a

Alternatives / Workarounds

n/a

[parse-github-assistant]

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