feat: updated Readme file with C implementation

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---

Author: Lokeshranjan8

lib/node_modules/@stdlib/number/float16/base/sub/README.md

@@ -98,6 +98,104 @@ logEachMap( 'x: %f, y: %f => %f', x, y, sub );
 
 <!-- /.examples -->
 
+<!-- C interface documentation. -->
+
+* * *
+
+<section class="c">
+
+## C APIs
+
+<!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
+
+<section class="intro">
+
+</section>
+
+<!-- /.intro -->
+
+<!-- C usage documentation. -->
+
+<section class="usage">
+
+### Usage
+
+```c
+#include "stdlib/number/float16/base/sub.h"
+```
+
+#### stdlib_base_float16_mul( x, y )
+
+Subtract two half-precision floating-point numbers.
+
+```c
+#include "stdlib/number/float16/ctor.h"
+
+stdlib_float16_t x = stdlib_float16_from_bits( 17664 ); // => 5.0
+stdlib_float16_t y = stdlib_float16_from_bits( 16384 ); // => 2.0
+
+stdlib_float16_t v = stdlib_base_float16_sub( x, y );
+```
+
+The function accepts the following arguments:
+
+-   **x**: `[in] stdlib_float16_t` first input value.
+-   **y**: `[in] stdlib_float16_t` second input value.
+
+```c
+stdlib_float16_t stdlib_base_float16_sub( const stdlib_float16_t x, const stdlib_float16_t y );
+```
+
+</section>
+
+<!-- /.usage -->
+
+<!-- C API usage notes. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="notes">
+
+</section>
+
+<!-- /.notes -->
+
+<!-- C API usage examples. -->
+
+<section class="examples">
+
+### Examples
+
+```c
+#include "stdlib/number/float16/base/sub.h"
+#include "stdlib/number/float16/ctor.h"
+#include "stdlib/number/float32/base/to_float16.h"
+#include "stdlib/number/float16/base/to_float32.h"
+#include <stdio.h>
+
+int main( void ) {
+   const float x[] = { 3.14f, -3.14f, 0.0f, 0.0f/0.0f };
+   const float y[] = { 3.14f, -3.14f, -0.0f, 0.0f/0.0f };
+
+   stdlib_float16_t v;
+   stdlib_float16_t w;
+   stdlib_float16_t z;
+   int i;
+   for ( i = 0; i < 4; i++ ) {
+      v = stdlib_base_float32_to_float16( x[ i ]);
+      w = stdlib_base_float32_to_float16( y[ i ]);
+      z = stdlib_base_float16_sub( v, w );
+      printf( "%f - %f = %f\n", stdlib_base_float16_to_float32( v ), stdlib_base_float16_to_float32( w ), stdlib_base_float16_to_float32( z ) );
+   }
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.c -->
+
 <!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
 
 <section class="related">