Add sponsorship files

Author: Stuk

documentation/_layouts/default.html

@@ -68,15 +68,16 @@
         <nav class="col-md-3">
         {% case page.section %}
         {% when "main" %}
-        <h4>JSZip users :</h4>
+        <h4>JSZip users:</h4>
         <ul class="nav">
               <li><a href="{{site.baseurl}}/">Installation</a></li>
               <li><a href="{{site.baseurl}}/documentation/faq.html">FAQ</a></li>
               <li><a href="{{site.baseurl}}/CHANGES.html">Changelog</a></li>
               <li><a href="{{site.baseurl}}/documentation/upgrade_guide.html">Upgrade guide</a></li>
               <li><a href="https://github.com/Stuk/jszip/issues">Bug tracker</a></li>
-        </ul>
-        <h4>JSZip developers :</h4>
+              <li><a href="{{site.baseurl}}/sponsors">Sponsorship</a></li>
+            </ul>
+        <h4>JSZip developers:</h4>
         <ul class="nav">
               <li><a href="{{site.baseurl}}/documentation/contributing.html">How to contribute</a></li>
               <li><a href="https://github.com/Stuk/jszip/graphs/contributors">Contributors</a></li>
@@ -131,7 +132,7 @@ <h4>Examples</h4>
               <li><a href="{{site.baseurl}}/documentation/examples/read-local-file-api.html">Read local file</a></li>
               <li><a href="{{site.baseurl}}/documentation/examples/get-binary-files-ajax.html">Read remote file</a></li>
               <li><a href="{{site.baseurl}}/documentation/examples/download-zip-file.html">Give the user its zip file</a></li>
-              <li><a href="{{site.baseurl}}/documentation/examples/downloader.html">Mini app : downloader</a></li>
+              <li><a href="{{site.baseurl}}/documentation/examples/downloader.html">Mini app: downloader</a></li>
         </ul>
         {% endcase %}
         <!-- <ul class="nav"> -->

sponsors.md

@@ -0,0 +1,21 @@
+---
+title: "Sponsors"
+layout: default
+section: main
+---
+
+[JSZip](https://github.com/Stuk/jszip) was created in 2009 by [Stuart](https://github.com/Stuk). Since then it has received well over [600 million downloads](https://npm-stat.com/charts.html?package=jszip&from=2009-06-20&to=2022-06-20), is depended on by over 3000 packages on npm, and powers zipping and unzipping on sites large and small.
+
+This project only exists because of all the work dedicated to it by me and the other contributors.
+
+If you or your company has benefited from JSZip then please consider [sponsoring on Github](https://github.com/sponsors/Stuk).
+
+## 💎 Diamond
+
+## 🥇 Gold
+
+## 🥈 Silver
+
+## 🥉 Bronze
+
+## Supporters