docs: add arjxn-py as a contributor for review (#3405)

* 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

@@ -614,7 +614,8 @@
       "contributions": [
         "infra",
         "code",
-        "doc"
+        "doc",
+        "review"
       ]
     },
     {

README.md

@@ -254,7 +254,7 @@ 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/jeromtom"><img src="https://avatars.githubusercontent.com/u/83979298?v=4?s=100" width="100px;" alt="Jerom Palimattom Tom"/><br /><sub><b>Jerom Palimattom Tom</b></sub></a><br /><a href="https://github.com/pybamm-team/PyBaMM/commits?author=jeromtom" title="Documentation">📖</a> <a href="https://github.com/pybamm-team/PyBaMM/commits?author=jeromtom" title="Code">💻</a> <a href="https://github.com/pybamm-team/PyBaMM/commits?author=jeromtom" title="Tests">⚠️</a></td>
       <td align="center" valign="top" width="14.28%"><a href="http://bradyplanden.github.io"><img src="https://avatars.githubusercontent.com/u/55357039?v=4?s=100" width="100px;" alt="Brady Planden"/><br /><sub><b>Brady Planden</b></sub></a><br /><a href="#example-BradyPlanden" title="Examples">💡</a></td>
       <td align="center" valign="top" width="14.28%"><a href="http://www.jsbrittain.com/"><img src="https://avatars.githubusercontent.com/u/98161205?v=4?s=100" width="100px;" alt="jsbrittain"/><br /><sub><b>jsbrittain</b></sub></a><br /><a href="https://github.com/pybamm-team/PyBaMM/commits?author=jsbrittain" title="Code">💻</a> <a href="https://github.com/pybamm-team/PyBaMM/commits?author=jsbrittain" title="Tests">⚠️</a></td>
-      <td align="center" valign="top" width="14.28%"><a href="https://github.com/arjxn-py"><img src="https://avatars.githubusercontent.com/u/104268427?v=4?s=100" width="100px;" alt="Arjun"/><br /><sub><b>Arjun</b></sub></a><br /><a href="#infra-arjxn-py" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a> <a href="https://github.com/pybamm-team/PyBaMM/commits?author=arjxn-py" title="Code">💻</a> <a href="https://github.com/pybamm-team/PyBaMM/commits?author=arjxn-py" title="Documentation">📖</a></td>
+      <td align="center" valign="top" width="14.28%"><a href="https://github.com/arjxn-py"><img src="https://avatars.githubusercontent.com/u/104268427?v=4?s=100" width="100px;" alt="Arjun"/><br /><sub><b>Arjun</b></sub></a><br /><a href="#infra-arjxn-py" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a> <a href="https://github.com/pybamm-team/PyBaMM/commits?author=arjxn-py" title="Code">💻</a> <a href="https://github.com/pybamm-team/PyBaMM/commits?author=arjxn-py" title="Documentation">📖</a> <a href="https://github.com/pybamm-team/PyBaMM/pulls?q=is%3Apr+reviewed-by%3Aarjxn-py" title="Reviewed Pull Requests">👀</a></td>
       <td align="center" valign="top" width="14.28%"><a href="https://github.com/chenzhao-py"><img src="https://avatars.githubusercontent.com/u/75906533?v=4?s=100" width="100px;" alt="CHEN ZHAO"/><br /><sub><b>CHEN ZHAO</b></sub></a><br /><a href="https://github.com/pybamm-team/PyBaMM/issues?q=author%3Achenzhao-py" title="Bug reports">🐛</a></td>
     </tr>
     <tr>