feat: add countIf to namespace

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---

Author: kgryte

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

@@ -99,6 +99,15 @@ setReadOnly( ns, 'castingModes', require( '@stdlib/ndarray/casting-modes' ) );
 */
 setReadOnly( ns, 'countFalsy', require( '@stdlib/ndarray/count-falsy' ) );
 
+/**
+* @name countIf
+* @memberof ns
+* @readonly
+* @type {Function}
+* @see {@link module:@stdlib/ndarray/count-if}
+*/
+setReadOnly( ns, 'countIf', require( '@stdlib/ndarray/count-if' ) );
+
 /**
 * @name countTruthy
 * @memberof ns