Add 'project' parameter to Markdown API (#1086)

Co-authored-by: jskim <jskim0450@argonet.co.kr>

Author: jmini

src/main/java/org/gitlab4j/api/models/MarkdownRequest.java

@@ -7,12 +7,19 @@ public class MarkdownRequest implements Serializable {
 
     private String text;
     private boolean gfm;
+    private String project;
 
     public MarkdownRequest(String text, boolean gfm) {
         this.text = text;
         this.gfm = gfm;
     }
 
+    public MarkdownRequest(String text, boolean gfm, String project) {
+        this.text = text;
+        this.gfm = gfm;
+        this.project = project;
+    }
+
     public String getText() {
         return text;
     }
@@ -28,4 +35,12 @@ public boolean isGfm() {
     public void setGfm(boolean gfm) {
         this.gfm = gfm;
     }
+
+    public String getProject() {
+        return project;
+    }
+
+    public void setProject(String project) {
+        this.project = project;
+    }
 }