You will get an error during the upload in the media gallery cause Magento uses the ImageMagic function to add a white background. You can ignore this error. The SVG will uploaded regardless and can be used.

Install

Install the extension via composer:

    composer install webidea24/magento2-module-svg-support

Disclaimer

please make sure, that nobody is allowed to upload SVGs who should not be allowed. SVGs are a little security problem, cause SVGs could contain malware (Javascript). Use this extension on your own risk!