2. Upload the DLL to your SDL Web server and place it somewhere local on the server. Then add the following in your %SDLWEB_HOME%\config\Tridion.ContentManager.config in tag:
<add assemblyFileName="[PATH TO DLL]\container-gravity-extension-v1.1.0.dll"/>
3. After that restart the services 'SDL Web Content Manager Service Host' and 'SDL Web Transport Distributor Service'
quick update Nic, from 1.5 to 1.6 now 1.7
New release is out (v1.1.1) with support for DXA1.7: github.com/.../dxa-container-framework