Add NumPy 2 migration announcement

Author: jakirkham

news/2024-05-15-numpy-2-migration.md

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+# NumPy 2 migration
+
+In preparation for the NumPy 2 release, we have begun a migration of all
+conda-forge packages that depend on `numpy` during the build (so in
+`requirements/host`). The migration status is tracked [on our status page](
+https://conda-forge.org/status/migration/numpy2 ). Particular package's status
+can be found there. Specific recommendations for maintainers updating packages
+can be found in the migration PRs themselves. Please reach out through the
+usual channels if you have any questions.