chore: add include file for FORTRAN

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Author: Shabareesh Shetty

lib/node_modules/@stdlib/blas/base/zaxpy/include/stdlib/blas/base/zaxpy_fortran.h

@@ -0,0 +1,43 @@
+/**
+* @license Apache-2.0
+*
+* Copyright (c) 2024 The Stdlib Authors.
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*    http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+/**
+* Header file containing function declarations for the Fortran interface to the BLAS Level 1 routine `zaxpy`.
+*/
+#ifndef STDLIB_BLAS_BASE_ZAXPY_FORTRAN_H
+#define STDLIB_BLAS_BASE_ZAXPY_FORTRAN_H
+
+#include "stdlib/complex/float64/ctor.h"
+
+/*
+* If C++, prevent name mangling so that the compiler emits a binary file having undecorated names, thus mirroring the behavior of a C/Fortran compiler (a Fortran compiler must be configured to not attach underscores).
+*/
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+* 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.
+*/
+void zaxpy( const int *, const stdlib_complex128_t *, const void *, const int *, void *, const int * );
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // !STDLIB_BLAS_BASE_ZAXPY_FORTRAN_H