docs: add thestbar as a contributor for doc (iluwatar#2576)

* docs: update README.md [skip ci]

* docs: update .all-contributorsrc [skip ci]

---------

Co-authored-by: allcontributors[bot] <46447321+allcontributors[bot]@users.noreply.github.com>

Author: allcontributors[bot]

Diff for: .all-contributorsrc

@@ -2587,6 +2587,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "thestbar",
+      "name": "Stavros Barousis",
+      "avatar_url": "https://avatars.githubusercontent.com/u/20283468?v=4",
+      "profile": "https://github.com/thestbar",
+      "contributions": [
+        "doc"
+      ]
     }
   ],
   "contributorsPerLine": 7,

Diff for: README.md

@@ -10,7 +10,7 @@
 [![Coverage](https://sonarcloud.io/api/project_badges/measure?project=iluwatar_java-design-patterns&metric=coverage)](https://sonarcloud.io/dashboard?id=iluwatar_java-design-patterns)
 [![Join the chat at https://gitter.im/iluwatar/java-design-patterns](https://badges.gitter.im/Join%20Chat.svg)](https://gitter.im/iluwatar/java-design-patterns?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 <!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
-[![All Contributors](https://img.shields.io/badge/all_contributors-284-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-285-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 <br/>
@@ -440,6 +440,7 @@ This project is licensed under the terms of the MIT license.
       <td align="center" valign="top" width="14.28%"><a href="https://surjendu-pal.netlify.app/"><img src="https://avatars.githubusercontent.com/u/101238933?v=4?s=100" width="100px;" alt="Surjendu"/><br /><sub><b>Surjendu</b></sub></a><br /><a href="#translation-surjendu104" title="Translation">🌍</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/bakazhou"><img src="https://avatars.githubusercontent.com/u/81795984?v=4?s=100" width="100px;" alt="bakazhou"/><br /><sub><b>bakazhou</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=bakazhou" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/Owen-CH-Leung"><img src="https://avatars.githubusercontent.com/u/43698890?v=4?s=100" width="100px;" alt="Owen Leung"/><br /><sub><b>Owen Leung</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Owen-CH-Leung" title="Code">💻</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/thestbar"><img src="https://avatars.githubusercontent.com/u/20283468?v=4?s=100" width="100px;" alt="Stavros Barousis"/><br /><sub><b>Stavros Barousis</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=thestbar" title="Documentation">📖</a></td>
     </tr>
   </tbody>
 </table>