feat: add ndindex to namespace

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---

Author: kgryte

lib/node_modules/@stdlib/ndarray/lib/index.js

@@ -225,6 +225,15 @@ setReadOnly( ns, 'scalar2ndarray', require( '@stdlib/ndarray/from-scalar' ) );
 */
 setReadOnly( ns, 'ind2sub', require( '@stdlib/ndarray/ind2sub' ) );
 
+/**
+* @name ndindex
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/ndarray/index}
+*/
+setReadOnly( ns, 'ndindex', require( '@stdlib/ndarray/index' ) );
+
 /**
 * @name indexModes
 * @memberof ns