Download the Drupal 8 SVG Image module like you would any other Drupal module. You can download it with Composer using the following command:
composer require drupal/svg_image
Install the SVG Image module.
Navigate to Structure > Content Types > Article and select Manage Fields. You should have an image field on your Article content type. Click the Edit button.
In the Allowed File Extensions text box add “svg” to the list.

Save the page, then go to the Manage display tab for the Article content type.
Click the gear icon next to your image field and you will notice you have additional options for SVG images. The first is that you can render the SVG as an
tag (which is enabled by default). The second is that you can set the width and height of the SVG image.

You can now create an Article and upload your SVG image!