added Spacing for paragraphs and ParagraphStyle

ts/docx/paragraph/index.ts

@@ -6,6 +6,7 @@ import { ThematicBreak } from "./border";
 import { Indent } from "./indent";
 import { PageBreak } from "./page-break";
 import { ParagraphProperties } from "./properties";
+import { ISpacingProperties, Spacing } from "./spacing";
 import { Style } from "./style";
 import { LeftTabStop, MaxRightTabStop } from "./tab-stop";
 import { NumberProperties } from "./unordered-list";
@@ -128,4 +129,9 @@ export class Paragraph extends XmlComponent {
         this.properties.push(new Indent(start, hanging));
         return this;
     }
+
+    public spacing(params: ISpacingProperties): Paragraph {
+        this.properties.push(new Spacing(params));
+        return this;
+    };
 }

ts/docx/paragraph/spacing.ts

@@ -0,0 +1,24 @@
+import { XmlAttributeComponent, XmlComponent } from "../xml-components";
+
+export interface ISpacingProperties {
+    after?: number;
+    before?: number;
+    line?: number;
+}
+
+class SpacingAttributes extends XmlAttributeComponent {
+    constructor(properties: ISpacingProperties) {
+        super({
+            after: "w:after",
+            before: "w:before",
+            line: "w:line",
+        }, properties);
+    }
+}
+
+export class Spacing extends XmlComponent {
+    constructor(opts: ISpacingProperties) {
+        super("w:spacing");
+        this.root.push(new SpacingAttributes(opts));
+    }
+}