Merge pull request graphql#1096 from alyssoncm/patch-2

Adding a new service : Back4App

Author: orta

src/content/code/services/back4app.md

@@ -0,0 +1,5 @@
+---
+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
+---