add initial marp implementation with sample content and build configuration

node_modules/speech-rule-engine/mjs/walker/dummy_walker.js

@@ -0,0 +1,36 @@
+import { AbstractWalker } from './abstract_walker.js';
+export class DummyWalker extends AbstractWalker {
+    up() {
+        return null;
+    }
+    down() {
+        return null;
+    }
+    left() {
+        return null;
+    }
+    right() {
+        return null;
+    }
+    repeat() {
+        return null;
+    }
+    depth() {
+        return null;
+    }
+    home() {
+        return null;
+    }
+    getDepth() {
+        return 0;
+    }
+    initLevels() {
+        return null;
+    }
+    combineContentChildren(_type, _role, _content, _children) {
+        return [];
+    }
+    findFocusOnLevel(_id) {
+        return null;
+    }
+}