feat: add toRotr90 to namespace

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---

Author: kgryte

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

@@ -981,6 +981,15 @@ setReadOnly( ns, 'toReversed', require( '@stdlib/ndarray/to-reversed' ) );
 */
 setReadOnly( ns, 'toReversedDimension', require( '@stdlib/ndarray/to-reversed-dimension' ) );
 
+/**
+* @name toRotr90
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/ndarray/to-rotr90}
+*/
+setReadOnly( ns, 'toRotr90', require( '@stdlib/ndarray/to-rotr90' ) );
+
 /**
 * @name ndarray2string
 * @memberof ns