Create INFO.md

Author: AB-xdev

openapi/INFO.md

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+This ``openapi.yml`` was written manually as Sched fails to provide an API schema or something similar.
+
+The Java API Client can be generated using ``mvn clean compile -P openapi-generator`` inside [``sched-java-client``](../openapi-client-maven-template/).
+
+Helpful links:
+* https://jsonformatter.org/json-to-jsonschema
+* https://swagger.io/specification/
+* https://editor.swagger.io/