chore: add ndarray example

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---

Author: ShabiShett07

lib/node_modules/@stdlib/blas/base/dzasum/examples/index.js

@@ -21,7 +21,7 @@
 var discreteUniform = require( '@stdlib/random/base/discrete-uniform' );
 var Complex128 = require( '@stdlib/complex/float64/ctor' );
 var filledarrayBy = require( '@stdlib/array/filled-by' );
-var dzasum = require( '@stdlib/blas/base/dzasum' );
+var dzasum = require( './../lib' );
 
 function rand() {
 	return new Complex128( discreteUniform( 0, 10 ), discreteUniform( -5, 5 ) );
@@ -31,5 +31,10 @@ function rand() {
 var x = filledarrayBy( 10, 'complex128', rand );
 console.log( x.toString() );
 
+// Compute the sum of the absolute values of each element:
 var out = dzasum( x.length, x, 1 );
 console.log( out );
+
+// Compute the sum of the absolute values of each element using alternative indexing semantics:
+out = dzasum.ndarray( x.length, x, 1, 0 );
+console.log( out );