Draft: Resolve "Zenodo Sandbox integration for PID (e.g. DOI)"

Closes #89

fda-citation-service/api/src/main/java/at/tuwien/api/zenodo/deposit/AccessTypeDto.java

+package at.tuwien.api.zenodo.deposit;
+
+public enum AccessTypeDto {
+
+    OPEN("open"),
+    EMBARGOED("embargoed"),
+    RESTRICTED("restricted"),
+    CLOSED("closed");
+
+    private final String type;
+
+    AccessTypeDto(final String type) {
+        this.type = type;
+    }
+
+    @Override
+    public String toString() {
+        return type;
+    }
+}