feat: add constants/float16/glaisher-kinkelin

lib/node_modules/@stdlib/constants/float16/glaisher-kinkelin/README.md

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+<!--
+
+@license Apache-2.0
+
+Copyright (c) 2025 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.
+
+-->
+
+# FLOAT16_GLAISHER
+
+> [Glaisher-Kinkelin][glaisher-constant] constant.
+
+<section class="intro">
+
+[Glaisher-Kinkelin][glaisher-constant] constant is defined as
+
+<!-- <equation class="equation" label="eq:glaisher_kinkelin_constant" align="center" raw="A = \lim_{n\to\infty} \frac{K(n + 1)}{n^{n^2/2 + n/2 + 1/12}e^{-n^2/4}}" alt="Glaisher-Kinkelin constant"> -->
+
+```math
+A = \lim_{n\to\infty} \frac{K(n + 1)}{n^{n^2/2 + n/2 + 1/12}e^{-n^2/4}}
+```
+
+<!-- <div class="equation" align="center" data-raw-text="A = \lim_{n\to\infty} \frac{K(n + 1)}{n^{n^2/2 + n/2 + 1/12}e^{-n^2/4}}" data-equation="eq:glaisher_kinkelin_constant">
+    <img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@6e1cf583c4854b3d982f22f361f53a30c9f552dc/lib/node_modules/@stdlib/constants/float64/glaisher-kinkelin/docs/img/equation_glaisher_kinkelin_constant.svg" alt="Glaisher-Kinkelin constant">
+    <br>
+</div> -->
+
+<!-- </equation> -->
+
+where
+
+<!-- <equation class="equation" label="eq:k_function" align="center" raw="K(n) = \prod_{k=1}^{n-1} k^k" alt="K-function"> -->
+
+```math
+K(n) = \prod_{k=1}^{n-1} k^k
+```
+
+<!-- <div class="equation" align="center" data-raw-text="K(n) = \prod_{k=1}^{n-1} k^k" data-equation="eq:k_function">
+    <img src="https://cdn.jsdelivr.net/gh/stdlib-js/stdlib@6e1cf583c4854b3d982f22f361f53a30c9f552dc/lib/node_modules/@stdlib/constants/float64/glaisher-kinkelin/docs/img/equation_k_function.svg" alt="K-function">
+    <br>
+</div> -->
+
+<!-- </equation> -->
+
+is the [K-function][k-function].
+
+</section>
+
+<!-- /.intro -->
+
+<section class="usage">
+
+## Usage
+
+```javascript
+var FLOAT16_GLAISHER = require( '@stdlib/constants/float16/glaisher-kinkelin' );
+```
+
+#### FLOAT16_GLAISHER
+
+The [Glaisher-Kinkelin][glaisher-constant] constant.
+
+```javascript
+var bool = ( FLOAT16_GLAISHER === 1.2822265625 );
+// returns true
+```
+
+</section>
+
+<!-- /.usage -->
+
+<section class="examples">
+
+## Examples
+
+<!-- TODO: better example -->
+
+<!-- eslint no-undef: "error" -->
+
+```javascript
+var FLOAT16_GLAISHER = require( '@stdlib/constants/float16/glaisher-kinkelin' );
+
+console.log( 'Glaisher\'s constant: %d', FLOAT16_GLAISHER );
+// => 'Glaisher\'s constant: 1.2822265625'
+```
+
+</section>
+
+<!-- /.examples -->
+
+<!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. -->
+
+<section class="related">
+
+</section>
+
+<!-- /.related -->
+
+<!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. -->
+
+<section class="links">
+
+[glaisher-constant]: https://en.wikipedia.org/wiki/Glaisher%E2%80%93Kinkelin_constant
+
+[k-function]: https://en.wikipedia.org/wiki/K-function
+
+</section>
+
+<!-- /.links -->