Create Firebase setup article

TemplateApplication/Supporting Files/TemplateApplication.docc/Firebase.md

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+# Set up a Firebase Backend for your Spezi Application
+
+<!--
+#
+# This source file is part of the Stanford Spezi Template Application open-source project
+#
+# SPDX-FileCopyrightText: 2023 Stanford University and the project authors (see CONTRIBUTORS.md)
+#
+# SPDX-License-Identifier: MIT
+#
+-->
+
+How to set up Google Firebase as a managed backend for you Spezi-based iOS application, including Authentication, Database, and Cloud Storage.
+
+## Introduction
+
+ [Google Firebase](https://firebase.google.com) is a set of managed backend cloud computing services and application development platforms provided by Google.
+ It hosts databases, services, authentication, and integration for a variety of applications, including mobile applications like the Spezi Template Application.
+ Stanford provides its version of a Firebase instance in the form of the [Stanford mHealth platform](https://med.stanford.edu/mhealth.html).
+ We use Firebase and the mHealth platform as the default integrated cloud provider in the Spezi Template Application.
+
+> Tip: Spezi itself is independent of any cloud provider or platform! Spezi offers different modules to connect to cloud providers, including [Spezi Firebase](https://github.com/StanfordSpezi/SpeziFirebase), which is the cloud provider demonstrated in the Spezi Template Application.
+
+## Set up your Local Firebase Emulator Environment
+
+The [Firebase Local Emulator Suite](https://firebase.google.com/docs/emulator-suite) allows you to build and test your app locally before deploying to the cloud. 

TemplateApplication/Supporting Files/TemplateApplication.docc/Setup.md

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 [Google Firebase](https://firebase.google.com) is a set of backend cloud computing services and application development platforms provided by Google.
 It hosts databases, services, authentication, and integration for a variety of applications, including mobile applications like the Spezi Template Application.
 Stanford provides its version of a Firebase instance in the form of the [Stanford mHealth platform](https://med.stanford.edu/mhealth.html).
-We use Firebase and the mHealt platform as the default integrated cloud provided in the Spezi Template Application.
+We use Firebase and the mHealth platform as the default integrated cloud provider in the Spezi Template Application.
 
 > Tip: Spezi itself is independent of any cloud provider or platform! Spezi offers different modules to connect to cloud providers, including [Spezi Firebase](https://github.com/StanfordSpezi/SpeziFirebase), which is the cloud provider demonstrated in the Spezi Template Application.