Add node modules and new code for release (#57)

Co-authored-by: taakleton <taakleton@users.noreply.github.com>

node_modules/underscore/cjs/index-default.js

@@ -0,0 +1,11 @@
+var index = require('./index.js');
+var mixin = require('./mixin.js');
+
+// Default Export
+
+// Add all of the Underscore functions to the wrapper object.
+var _ = mixin(index);
+// Legacy Node.js API.
+_._ = _;
+
+module.exports = _;