Update Custom.md

.github/ISSUE_TEMPLATE/Custom.md

@@ -6,6 +6,7 @@ labels: ''
 assignees: ''
 
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+Before you start, we need a little bit more information from you:
 
 Use Case (delete as appropriate): Using Portainer at Home, Using Portainer in a Commerical setup.
 Have you reviewed our technical documentation and knowledge base? Yes/No