Add extracted source directory and README navigation

extracted-source/node_modules/@mixmark-io/domino/lib/MutationConstants.js

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+"use strict";
+module.exports = {
+  VALUE: 1, // The value of a Text, Comment or PI node changed
+  ATTR: 2, // A new attribute was added or an attribute value and/or prefix changed
+  REMOVE_ATTR: 3, // An attribute was removed
+  REMOVE: 4, // A node was removed
+  MOVE: 5, // A node was moved
+  INSERT: 6 // A node (or a subtree of nodes) was inserted
+};