Feat/embedded fonts (#2174)

* #239 Embedded fonts

* Add boilerplate for font table

* Fix linting

* Fix linting

* Fix odttf naming

* Correct writing of fonts to relationships and font table

new uuid function

* Add font to run

* Add demo

Fix tests

* Add character set support

* Add tests

* Write tests

demo/92-declarative-custom-fonts.ts

@@ -0,0 +1,44 @@
+// Simple example to add text to a document
+
+import * as fs from "fs";
+import { Document, Packer, Paragraph, Tab, TextRun } from "docx";
+
+const font = fs.readFileSync("./demo/assets/Pacifico.ttf");
+
+const doc = new Document({
+    styles: {
+        default: {
+            document: {
+                run: {
+                    font: "Pacifico",
+                },
+            },
+        },
+    },
+    sections: [
+        {
+            properties: {},
+            children: [
+                new Paragraph({
+                    children: [
+                        new TextRun("Hello World"),
+                        new TextRun({
+                            text: "Foo Bar",
+                            bold: true,
+                            size: 40,
+                        }),
+                        new TextRun({
+                            children: [new Tab(), "Github is the best"],
+                            bold: true,
+                        }),
+                    ],
+                }),
+            ],
+        },
+    ],
+    fonts: [{ name: "Pacifico", data: font, characterSet: "00" }],
+});
+
+Packer.toBuffer(doc).then((buffer) => {
+    fs.writeFileSync("My Document.docx", buffer);
+});