add initial marp implementation with sample content and build configuration

node_modules/speech-rule-engine/mjs/highlighter/css_highlighter.js

@@ -0,0 +1,24 @@
+import { AbstractHighlighter } from './abstract_highlighter.js';
+export class CssHighlighter extends AbstractHighlighter {
+    constructor() {
+        super();
+        this.mactionName = 'mjx-maction';
+    }
+    highlightNode(node) {
+        const info = {
+            node: node,
+            background: node.style.backgroundColor,
+            foreground: node.style.color
+        };
+        if (!this.isHighlighted(node)) {
+            const color = this.colorString();
+            node.style.backgroundColor = color.background;
+            node.style.color = color.foreground;
+        }
+        return info;
+    }
+    unhighlightNode(info) {
+        info.node.style.backgroundColor = info.background;
+        info.node.style.color = info.foreground;
+    }
+}