feat: add readme contain for c implementation

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---

Author: Vinit-Pandit

lib/node_modules/@stdlib/math/base/special/minmaxf/README.md

@@ -20,7 +20,7 @@ limitations under the License.
 
 # minmaxf
 
-> Return the minimum and maximum values.
+> Return the minimum and maximum values for single-precision floating-point number.
 
 <!-- Section to include introductory text. Make sure to keep an empty line after the intro `section` element and another before the `/section` close. -->
 
@@ -42,7 +42,7 @@ var minmaxf = require( '@stdlib/math/base/special/minmaxf' );
 
 #### minmaxf( x, y )
 
-Returns the minimum and maximum values in a single pass.
+Returns the minimum and maximum values in a single pass for single-precision floating-point number.
 
 ```javascript
 var v = minmaxf( 4.0, 3.0 );
@@ -119,6 +119,100 @@ for ( i = 0; i < 100; i++ ) {
 
 <!-- /.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">
+
+### Usages
+
+```c
+#include "stdlib/math/base/special/minmaxf.h"
+```
+
+#### stdlib_base_minmaxf( x, y, min, max )
+
+Returns the minimum and maximum for single-precision floating-point number.
+
+```c
+float min;
+float max;
+stdlib_base_minmaxf( 3.2, 4.1, &min, &max );
+
+stdlib_base_minmaxf( 0.0f, -0.0f, &min, &max );
+```
+
+The function accepts the following arguments:
+
+-   **x**: `[in] float` input value.
+-   **y**: `[in] float` input value.
+-   **min**: `[in] *float` output min.
+-   **max**: `[in] *float` output max.
+
+```c
+void stdlib_base_minmaxf( const float x, const float y, float* min, float* max );
+```
+
+</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/math/base/special/minmaxf.h"
+#include <stdio.h>
+
+int main(void) {
+    const float x1[] = { 1.0, 0.45, -0.89, 0.0 / 0.0, -0.78, -0.22, 0.66, 0.11, -0.55, 0.0 };
+    const float x2[] = { -0.22, 0.66, 0.0, -0.55, 0.33, 1.0, 0.0 / 0.0, 0.11, 0.45, -0.78 };
+
+    float min;
+    float max;
+    int i;
+
+    for ( i = 0; i < 10; i++ ) {
+        stdlib_base_minmaxf( x1[i], x2[i], &min, &max);
+        printf( "x1[ %d ]: %f, x2[ %d ]: %f, minmaxf( x1[ %d ], x2[ %d ] ): ( %f, %f )\n", i, x1[ i ], i, x2[ i ], i, i, min, max );
+    }
+}
+```
+
+</section>
+
+<!-- /.examples -->
+
+</section>
+
+<!-- /.c -->
+
 <!-- Section to include cited references. If references are included, add a horizontal rule *before* the section. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
 
 <section class="references">