add standard attrs parsing interface

nib/parse/default.nix

@@ -0,0 +1,13 @@
+{
+  attrs,
+  result,
+}: let
+  struct = import ./struct.nix {inherit attrs result;};
+in
+  builtins.listToAttrs [
+    # submodule is included directly to this module (ie self.myFunc)
+    struct
+
+    # submodule content is accessible first by submodule name
+    # then by the name of the content (ie self.submodule.myFunc)
+  ]