docs: add zStupan as a contributor for code, bug, and 4 more

.all-contributorsrc

@@ -0,0 +1,31 @@
+{
+  "files": [
+    "README.md"
+  ],
+  "imageSize": 100,
+  "commit": false,
+  "commitType": "docs",
+  "commitConvention": "angular",
+  "contributors": [
+    {
+      "login": "zStupan",
+      "name": "zStupan",
+      "avatar_url": "https://avatars.githubusercontent.com/u/48752988?v=4",
+      "profile": "https://github.com/zStupan",
+      "contributions": [
+        "code",
+        "bug",
+        "doc",
+        "content",
+        "ideas",
+        "example"
+      ]
+    }
+  ],
+  "contributorsPerLine": 7,
+  "skipCi": true,
+  "repoType": "github",
+  "repoHost": "https://github.com",
+  "projectName": "NiaARM",
+  "projectOwner": "firefly-cpp"
+}

README.md

@@ -1,4 +1,7 @@
 <p align="center">
+<!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
+[![All Contributors](https://img.shields.io/badge/all_contributors-1-orange.svg?style=flat-square)](#contributors-)
+<!-- ALL-CONTRIBUTORS-BADGE:END -->
   <img alt="logo" width="300" src="https://raw.githubusercontent.com/firefly-cpp/NiaARM/main/.github/images/logo.png">
 </p>
 
@@ -313,3 +316,25 @@ This framework is provided as-is, and there are no guarantees that it fits your
 ## Cite us
 
 Stupan, Ž., & Fister Jr., I. (2022). [NiaARM: A minimalistic framework for Numerical Association Rule Mining](https://www.theoj.org/joss-papers/joss.04448/10.21105.joss.04448.pdf). Journal of Open Source Software, 7(77), 4448.
+
+## Contributors ✨
+
+Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/docs/en/emoji-key)):
+
+<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-disable -->
+<table>
+  <tbody>
+    <tr>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/zStupan"><img src="https://avatars.githubusercontent.com/u/48752988?v=4?s=100" width="100px;" alt="zStupan"/><br /><sub><b>zStupan</b></sub></a><br /><a href="https://github.com/firefly-cpp/NiaARM/commits?author=zStupan" title="Code">💻</a> <a href="https://github.com/firefly-cpp/NiaARM/issues?q=author%3AzStupan" title="Bug reports">🐛</a> <a href="https://github.com/firefly-cpp/NiaARM/commits?author=zStupan" title="Documentation">📖</a> <a href="#content-zStupan" title="Content">🖋</a> <a href="#ideas-zStupan" title="Ideas, Planning, & Feedback">🤔</a> <a href="#example-zStupan" title="Examples">💡</a></td>
+    </tr>
+  </tbody>
+</table>
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+
+<!-- ALL-CONTRIBUTORS-LIST:END -->
+
+This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!