add basic auth model for Organization

backend/src/rbac/main.polar

@@ -0,0 +1,15 @@
+# Actoers 
+actor User {}
+ 
+# Resource block
+resource Organization {
+  permissions = ["view", "delete", "edit_billing", "edit_members"];
+  roles = ["owner", "member"];
+
+  "view" if "member";
+  "delete" if "owner";
+  "edit_billing" if "owner";
+  "edit_members" if "owner";
+
+  "member" if "owner";
+}