Create back4app.md

Author: alyssoncm

src/content/code/services/back4app.md

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+---
+name: Back4App
+description: Fully managed GraphQL backend based on open source Parse Platform. Store and query relational data, run cloud functions and more over GraphQL API. Free to get started.
+url: https://www.back4app.com/docs/parse-graphql/graphql-getting-started
+---