title: Create custom entities as in Dynamics 365 in C#
body: <p>I want to create a solution that deploys (creates) set of custom entities. how can i do this? would i use plugins? what would be the activation event? </p>
  
  <p>I want to create a c# solution package that i can deploy to any Dynamics 365 that creates custom entities.</p>
  
  <p>any help is appreciate it on this.</p>