Create MS Graph schema extension using POST https://graph.microsoft.com/v1.0/schemaExtensions.

• command graph schemaextension add --id <id> --description|-d <description> --owner|-o [owner] --targetTypes|-t <types> --properties|-p <properties>
• types: comma-separated list of target types
• properties: JSON string with the properties

Note: requires #10

More information: https://developer.microsoft.com/en-us/graph/docs/api-reference/v1.0/api/schemaextension_post_schemaextensions