Add getting started self guided help system for missing user setup

mayan/apps/main/classes.py

@@ -8,3 +8,19 @@ class FrontPageButton(object):
     def __init__(self, link):
         self.link = link
         self.__class__._registry.append(link)
+
+
+class MissingItem(object):
+    _registry = []
+
+    @classmethod
+    def get_all(cls):
+        return cls._registry
+
+    def __init__(self, label, condition, description, view):
+        self.label = label
+        self.condition = condition
+        self.description = description
+        self.view = view
+        self.__class__._registry.append(self)
+