Add some basic information on grouping observational data into tier1, tier2 and tier3. Mark tier3 datasets for which we obtained permission from the dataset providers to share the data among ESMValTool users on HPC systems.
Closes #3331
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Description
Add some basic information on grouping observational data into tier1, tier2 and tier3. Mark tier3 datasets for which we obtained permission from the dataset providers to share the data among ESMValTool users on HPC systems.
Checklist
It is the responsibility of the author to make sure the pull request is ready to review. The icons indicate whether the item will be subject to the ๐ Technical or ๐งช Scientific review.