feat: add rotr90 to namespace

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---

Author: kgryte

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

@@ -1138,6 +1138,15 @@ setReadOnly( ns, 'reverse', require( '@stdlib/ndarray/base/reverse' ) );
 */
 setReadOnly( ns, 'reverseDimension', require( '@stdlib/ndarray/base/reverse-dimension' ) );
 
+/**
+* @name rotr90
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/ndarray/base/rotr90}
+*/
+setReadOnly( ns, 'rotr90', require( '@stdlib/ndarray/base/rotr90' ) );
+
 /**
 * @name serializeMetaData
 * @memberof ns