Write a clear instructions email about the monuments database and wikidata for the wlm-announce list.

The scenarios it should reply to:

1. I'm not sure if my country is in the monuments database. What do I do?
2. We're transferring to wikidata and didn't tell you yet. I thought it would be fine right away. What do I do?
3. My country is in the monuments database, but I have no idea what to do with that information. What maintenance pages should I check?
4. A very brief explanation how to deal with having a new ID after moving to wikidata (might need a new template on commons?)

For example, see https://commons.wikimedia.org/wiki/Commons_talk:Wiki_Loves_Monuments_2019/Landing_pages#Landing_page_-_Brazil .

There are at least three countries that moved already to Wikidata: Slovenia, Brazil and Portugal.