Issue template for new instances.

.gitlab/issue_templates/new_instance

+# Please fill all these info:
+
+## General info
+
+- Name of the instance: 
+- Domain:
+
+## Settings:
+
+- Does the instance allow people to sign up?
+- Does the instance want new people to get a welcome email?
+- Which modules the client needs (default = dashboard, circles, analytics - later: user directory, job board, projects)
+
+## Federation:
+
+**Provide here the list of instances the new instance wants to be federated with. Please confirm if this new instance is also ok with those instances accessing their public data.**
+
+## Cosmetics
+
+Logo:
+Favicon:
+A set of 2/3/4 colors:
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