Add a documentation class.

src/main/java/org/nwapw/abacus/fx/DocumentationCell.java

@@ -0,0 +1,36 @@
+package org.nwapw.abacus.fx;
+
+import javafx.scene.control.Label;
+import javafx.scene.control.ListCell;
+import org.nwapw.abacus.function.Documentation;
+
+public class DocumentationCell extends ListCell<Documentation> {
+
+    private Label codeNameLabel;
+    private Label nameLabel;
+    private Label description;
+    private Label longDescription;
+
+    public DocumentationCell(){
+        codeNameLabel = new Label();
+        nameLabel = new Label();
+        description = new Label();
+        longDescription = new Label();
+    }
+
+    @Override
+    protected void updateItem(Documentation item, boolean empty) {
+        super.updateItem(item, empty);
+        if(empty){
+            codeNameLabel.setText("");
+            nameLabel.setText("");
+            description.setText("");
+            longDescription.setText("");
+        } else {
+            codeNameLabel.setText(item.getCodeName());
+            nameLabel.setText(item.getName());
+            description.setText(item.getDescription());
+            longDescription.setText(item.getLongDescription());
+        }
+    }
+}