docs: add AlfieRichardsArm as a contributor for code (#399)

Adds @AlfieRichardsArm as a contributor for code.

This was requested by vhscampos [in this
comment](#386 (comment))

[skip ci]

---------

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

Author: allcontributors[bot]

.all-contributorsrc

@@ -396,6 +396,15 @@
       "contributions": [
         "code"
       ]
+    },
+    {
+      "login": "AlfieRichardsArm",
+      "name": "Alfie Richards",
+      "avatar_url": "https://avatars.githubusercontent.com/u/156316945?v=4",
+      "profile": "https://github.com/AlfieRichardsArm",
+      "contributions": [
+        "code"
+      ]
     }
   ],
   "contributorsPerLine": 7,

README.md

@@ -141,6 +141,9 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/yury-khrustalev"><img src="https://avatars.githubusercontent.com/u/47541527?v=4?s=100" width="100px;" alt="Yury Khrustalev"/><br /><sub><b>Yury Khrustalev</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=yury-khrustalev" title="Code">💻</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://www.rdfm.org/"><img src="https://avatars.githubusercontent.com/u/111884?v=4?s=100" width="100px;" alt="Claudio Bantaloukas"/><br /><sub><b>Claudio Bantaloukas</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=rockdreamer" title="Code">💻</a></td>
     </tr>
+    <tr>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/AlfieRichardsArm"><img src="https://avatars.githubusercontent.com/u/156316945?v=4?s=100" width="100px;" alt="Alfie Richards"/><br /><sub><b>Alfie Richards</b></sub></a><br /><a href="https://github.com/ARM-software/acle/commits?author=AlfieRichardsArm" title="Code">💻</a></td>
+    </tr>
   </tbody>
 </table>