chore: add ndarray api

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---

Author: Shabareesh Shetty

lib/node_modules/@stdlib/blas/base/zaxpy/src/zaxpy_cblas.c

@@ -35,5 +35,24 @@ void API_SUFFIX(c_zaxpy)( const CBLAS_INT N, const stdlib_complex128_t alpha, vo
 	stdlib_complex128_t *x = (stdlib_complex128_t *)X;
 	stdlib_complex128_t *y = (stdlib_complex128_t *)Y;
 
-	API_SUFFIX(cblas_zaxpy)( N, alpha, (void *)x, strideX, (void *)y, strideY );
+	cblas_zaxpy( N, alpha, (void *)x, strideX, (void *)y, strideY );
+}
+
+/**
+* Scales a double-precision complex floating-point vector by a double-precision complex floating-point constant and adds the result to a double-precision complex floating-point vector using alternative indexing semantics.
+*
+* @param N        number of indexed elements
+* @param alpha    scalar constant
+* @param X        input array
+* @param strideX  X stride length
+* @param offsetX  starting index for X
+* @param Y        output array
+* @param strideY  Y stride length
+* @param offsetY  starting index for Y
+*/
+void API_SUFFIX(c_zaxpy_ndarray)( const CBLAS_INT N, const stdlib_complex128_t alpha, const void *X, const CBLAS_INT strideX, const CBLAS_INT offsetX, void *Y, const CBLAS_INT strideY, const CBLAS_INT offsetY ) {
+	stdlib_complex128_t *x = (stdlib_complex128_t *)X;
+	stdlib_complex128_t *y = (stdlib_complex128_t *)Y;
+
+	cblas_zaxpy( N, alpha, (void *)x, strideX, (void *)y, strideY );
 }

lib/node_modules/@stdlib/blas/base/zaxpy/src/zaxpy_f.c

@@ -36,5 +36,21 @@ void API_SUFFIX(c_zaxpy)( const CBLAS_INT N, const stdlib_complex128_t alpha, co
 	stdlib_complex128_t *y = (stdlib_complex128_t *)Y;
 
 	zaxpy( &N, &alpha, (void *)x, &strideX, (void *)y, &strideY );
-	return;
+}
+
+/**
+* Scales a double-precision complex floating-point vector by a double-precision complex floating-point constant and adds the result to a double-precision complex floating-point vector.
+*
+* @param N        number of indexed elements
+* @param alpha    scalar constant
+* @param X        input array
+* @param strideX  X stride length
+* @param Y        output array
+* @param strideY  Y stride length
+*/
+void API_SUFFIX(c_zaxpy_ndarray)( const CBLAS_INT N, const stdlib_complex128_t alpha, const void *X, const CBLAS_INT strideX, const CBLAS_INT offsetX, void *Y, const CBLAS_INT strideY, const CBLAS_INT offsetY ) {
+	stdlib_complex128_t *x = (stdlib_complex128_t *)X;
+	stdlib_complex128_t *y = (stdlib_complex128_t *)Y;
+
+	zaxpy( N, alpha, (void *)x, strideX, (void *)y, strideY );
 }