Add header objects and demo

src/export/packer/compiler.ts

@@ -42,6 +42,7 @@ export class Compiler {
         });
         const xmlNumbering = xml(this.formatter.format(this.file.Numbering));
         const xmlRelationships = xml(this.formatter.format(this.file.Relationships));
+        const xmlHeader = xml(this.formatter.format(this.file.Header));
 
         this.archive.append(xmlDocument, {
             name: "word/document.xml",
@@ -59,6 +60,10 @@ export class Compiler {
             name: "word/numbering.xml",
         });
 
+        this.archive.append(xmlHeader, {
+            name: "word/header1.xml",
+        });
+
         this.archive.append(xmlRelationships, {
             name: "word/_rels/document.xml.rels",
         });