METADATA: Metadata taxonomy for FAIR data

[jeanpaulrsoucy]

We must create a metadata taxonomy for the archived datasets, add the metadata to the list of datasets (#13) and use these metadata to make it easy for individuals to find, understand and acquire FAIR COVID-19 data (#8, #9).

Examples:

• Types of values (e.g., cases, testing, hospitalizations)
• Format (e.g., cumulative total, daily values, etc.)
• Time period covered

It should also be possible to link multiple datasets as covering the same data over an extended time period (e.g., if the dataset's name/URL changes but it replaces a previous dataset with similar data) and indicate when the characteristics of the same dataset change over time (e.g., same dataset/URL but the contents of the file change over time).