docs: add SandhyaDevadiga as a contributor for code (#3585)

* docs: update README.md [skip ci]

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

---------

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

.all-contributorsrc

@@ -3773,6 +3773,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "SandhyaDevadiga",
+      "name": "Sandhya",
+      "avatar_url": "https://avatars.githubusercontent.com/u/128058717?v=4",
+      "profile": "https://github.com/SandhyaDevadiga",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 6,

README.md

@@ -6,7 +6,7 @@
 [![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-414-orange.svg?style=flat-square)](#contributors-)
+[![All Contributors](https://img.shields.io/badge/all_contributors-415-orange.svg?style=flat-square)](#contributors-)
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 <br/>
@@ -613,6 +613,9 @@ This project is licensed under the terms of the MIT license.
       <td align="center" valign="top" width="16.66%"><a href="https://github.com/AnveshSrivastava"><img src="https://avatars.githubusercontent.com/u/170334970?v=4?s=100" width="100px;" alt="Anvesh Srivastava"/><br /><sub><b>Anvesh Srivastava</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=AnveshSrivastava" title="Code">💻</a></td>
       <td align="center" valign="top" width="16.66%"><a href="https://github.com/Mukul-Howale"><img src="https://avatars.githubusercontent.com/u/110479646?v=4?s=100" width="100px;" alt="Mukul Howale"/><br /><sub><b>Mukul Howale</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=Mukul-Howale" title="Code">💻</a></td>
     </tr>
+    <tr>
+      <td align="center" valign="top" width="16.66%"><a href="https://github.com/SandhyaDevadiga"><img src="https://avatars.githubusercontent.com/u/128058717?v=4?s=100" width="100px;" alt="Sandhya"/><br /><sub><b>Sandhya</b></sub></a><br /><a href="https://github.com/iluwatar/java-design-patterns/commits?author=SandhyaDevadiga" title="Code">💻</a></td>
+    </tr>
   </tbody>
 </table>