Added skeleton workflow templates

src/main/java/org/ical4j/template/workflow/Approval.java

@@ -0,0 +1,23 @@
+package org.ical4j.template.workflow;
+
+import net.fortuna.ical4j.model.component.VToDo;
+import org.ical4j.template.AbstractTemplate;
+
+/**
+ * Captures an approval step as part of a workflow.
+ */
+public class Approval extends AbstractTemplate<VToDo> {
+
+    public Approval() {
+        super(VToDo.class);
+    }
+
+    public Approval(Class<VToDo> typeClass) {
+        super(typeClass);
+    }
+
+    @Override
+    public VToDo apply(VToDo vToDo) {
+        return vToDo;
+    }
+}

src/main/java/org/ical4j/template/workflow/Request.java

@@ -0,0 +1,29 @@
+package org.ical4j.template.workflow;
+
+import net.fortuna.ical4j.extensions.concept.RequestType;
+import net.fortuna.ical4j.model.component.VToDo;
+import org.ical4j.template.AbstractTemplate;
+
+public class Request extends AbstractTemplate<VToDo> {
+
+    private RequestType requestType;
+
+    public Request() {
+        super(VToDo.class);
+    }
+
+    public Request(Class<VToDo> typeClass) {
+        super(typeClass);
+    }
+
+    public Request type(String summary, RequestType requestType) {
+        this.requestType = requestType;
+        return this;
+    }
+
+    @Override
+    public VToDo apply(VToDo vToDo) {
+        vToDo.replace(requestType);
+        return vToDo;
+    }
+}

src/main/java/org/ical4j/template/workflow/Roster.java

@@ -0,0 +1,20 @@
+package org.ical4j.template.workflow;
+
+import net.fortuna.ical4j.model.component.VAvailability;
+import org.ical4j.template.AbstractTemplate;
+
+public class Roster extends AbstractTemplate<VAvailability> {
+
+    public Roster() {
+        super(VAvailability.class);
+    }
+
+    public Roster(Class<VAvailability> typeClass) {
+        super(typeClass);
+    }
+
+    @Override
+    public VAvailability apply(VAvailability vAvailability) {
+        return vAvailability;
+    }
+}

src/main/java/org/ical4j/template/workflow/Workspace.java

@@ -0,0 +1,45 @@
+package org.ical4j.template.workflow;
+
+import net.fortuna.ical4j.vcard.VCard;
+import net.fortuna.ical4j.vcard.property.Fn;
+import net.fortuna.ical4j.vcard.property.Member;
+import org.ical4j.template.AbstractTemplate;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * A workspace represents a collaborative space for one or more members. A member can be an individual or
+ * a group.
+ */
+public class Workspace extends AbstractTemplate<VCard> {
+
+    private String title;
+
+    private List<VCard> members = new ArrayList<>();
+
+    public Workspace() {
+        super(VCard.class);
+    }
+
+    public Workspace(Class<VCard> typeClass) {
+        super(typeClass);
+    }
+
+    public Workspace title(String title) {
+        this.title = title;
+        return this;
+    }
+
+    public Workspace member(VCard member) {
+        members.add(member);
+        return this;
+    }
+
+    @Override
+    public VCard apply(VCard vCard) {
+        vCard.replace(new Fn(title));
+        members.forEach(m -> vCard.add(new Member(m)));
+        return vCard;
+    }
+}