docs(google cloud healthcare): Added recipe docs for setting up Google Cloud Healthcare API (#3641)

platform/docs/docs/deployment/google-cloud-healthcare.md

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+---
+sidebar_position: 9
+---
+
+# Google Cloud Healthcare
+
+> The [Google Cloud Healthcare API](https://cloud.google.com/healthcare/) is a
+> powerful option for storing medical imaging data in the cloud.
+
+An alternative to deploying your own PACS is to use a software-as-a-service
+provider such as Google Cloud. The Cloud Healthcare API promises to be a
+scalable, secure, cost effective image storage solution for those willing to
+store their data in the cloud. It offers an
+[almost-entirely complete DICOMWeb API](https://cloud.google.com/healthcare/docs/dicom)
+which requires tokens generated via the
+[OAuth 2.0 Sign In flow](https://developers.google.com/identity/protocols/oauth2).
+Images can even be transcoded on the fly if this is desired.
+
+## Setup a Google Cloud Healthcare Project
+
+1. Create a Google Cloud account
+2. Create a project in Google Cloud
+
+    A project in Google Cloud can be created by clicking the projects drop down box.
+
+    ![Google projects drop down](../assets/img/google-projects-drop-down.png)
+
+    And then clicking the `NEW PROJECT` button in the top-right corner of the
+    dialogue that is displayed.
+
+3. Enable the [Cloud Healthcare API](https://cloud.google.com/healthcare/) for your project
+
+   :::tip
+   An API can be enabled through the `APIs & Services > Enabled APIs & Services`
+   console and clicking the `+ ENABLE APIS AND SERVICES` button.
+
+   ![Google enable apis](../assets/img/google-enable-apis.png)
+   :::
+
+   :::tip
+   The principal (i.e. account) that is enabling the Cloud Healthcare API will require
+   the following roles that can be set in the `IAM & Admin > IAM` console for the
+   desired project.
+    - Service Usage Viewer
+    - Service Usage Admin
+   :::
+
+   :::tip
+   Roles can be added to a principal in the `IAM & Admin > IAM` console by clicking
+   the `Edit principal` (i.e. pencil) icon to the right of a principal or by clicking the
+   `GRANT ACCESS` button at the top of the list of principals. The `GRANT ACCESS`
+   button is particularly useful if the `Edit principal` icon is disabled.
+   :::
+
+4. (Optional): Create a Dataset and DICOM Data Store for storing your DICOM data
+
+    :::tip
+    To both list existing datasets as well as create a new dataset for your project,
+    the principal (i.e. account) must have the following roles enabled
+    in the `IAM & Admin > IAM` console.
+
+    - Editor
+
+    :::
+
+5. Enable the [Cloud Resource Manager API](https://cloud.google.com/resource-manager/) for your project.
+
+   _Note:_ If you are having trouble finding the APIs, use the search box at
+    the top of the Cloud console.
+
+6. Go to APIs & Services > OAuth Consent Screen to create an OAuth Consent screen and fill in your application details.
+
+   - Run through the three step process of adding an OAuth Consent Screen, clicking `SAVE AND CONTINUE` at the end of each step.
+
+      ![Google OAuth Consent Screen steps](../assets/img/google-oauth-consent-steps.png)
+   - For the Scopes step, for Google APIs, click the `ADD OR REMOVE SCOPES` button.
+   - In the `Update selected scopes` dialogue that flies in from the right, add the
+   following scopes to the `Manually add scopes` text box.
+     - `https://www.googleapis.com/auth/cloudplatformprojects.readonly`
+     - `https://www.googleapis.com/auth/cloud-healthcare`
+
+      ![Google Manually Add Scopes](../assets/img/google-manually-add-scopes.png)
+
+   - Click `ADD TO TABLE` and then click `UPDATE`
+
+
+7. Go to APIs & Services > Credentials to create a new set of credentials:
+
+    - Click `+ CREATE CREDENTIALS` and from the drop down select `OAuth Client ID`.
+    See [OAuth 2.0 Client ID](https://developers.google.com/identity/protocols/oauth2/) for more information.
+
+      ![Google Create Credentials](../assets/img/google-create-credentials.png)
+
+    - Choose the "Web Application" type
+    - Add your domain (e.g. `http://localhost:3000`) to the Authorized JavaScript
+    origins.
+    - Add your domain, plus `callback` (e.g. `http://localhost:3000/callback`) to the Authorized Redirect URIs.
+    - Save your Client ID for later.
+
+8. (Optional): Create a bucket containing DICOM files and import it into a Data Store
+
+    - When importing a bucket into a Data Store, the following warning might be
+      displayed indicating that the Cloud Healthcare Service Agent service account associated with the
+      project does not have the `Storage Object Viewer` role.
+
+      ![Google Create Credentials](../assets/img/google-healthcare-service-agent-warning.png)
+
+    - The Cloud Healthcare Service Agent service account can be displayed in the
+    `IAM & Admin > IAM` console by checking the `Include Google-provided role grants` checkbox.
+    The `Storage Object Viewer` role can then be granted to the Cloud Healthcare Service Agent service account.
+
+      ![Google Provided Accounts Checkbox](../assets/img/google-provided-accounts-checkbox.png)
+
+    - More information regarding the Cloud Healthcare Service Agent service account can
+    be found at https://cloud.google.com/healthcare-api/docs/permissions-healthcare-api-gcp-products
+
+9. (Optional): Enable Public Datasets that are being hosted by Google:
+  https://cloud.google.com/healthcare/docs/resources/public-datasets/
+
+## Run the viewer with your OAuth Client ID
+
+1. Open the `config/google.js` file and change `YOURCLIENTID` to your Client ID
+   value.
+1. Run the OHIF Viewer using the config/google.js configuration file
+
+```bash
+cd OHIFViewer
+yarn install
+APP_CONFIG=config/google.js yarn run dev
+```