[MIG] base_import_match: Migration to 12.0

base_import_match/readme/CONFIGURE.rst

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+To configure this module, you need to:
+
+#. Go to *Settings > Technical > Database Structure > Import Match*.
+#. *Create*.
+#. Choose a *Model*.
+#. Choose the *Fields* that conform a unique key in that model.
+#. If the rule must be used only for certain imported values, check
+   *Conditional* and enter the **exact string** that is going to be imported
+   in *Imported value*.
+
+   #. Keep in mind that the match here is evaluated as a case sensitive
+      **text string** always. If you enter e.g. ``True``, it will match that
+      string, but will not match ``1`` or ``true``.
+#. *Save*.
+
+In that list view, you can sort rules by drag and drop.