docs: add @sbryngelson as a contributor

Author: sbryngelson

.all-contributorsrc

@@ -0,0 +1,25 @@
+{
+  "projectName": "MFC",
+  "projectOwner": "sbryngelson",
+  "repoType": "github",
+  "repoHost": "https://github.com",
+  "files": [
+    "README.md"
+  ],
+  "imageSize": 100,
+  "commit": true,
+  "commitConvention": "angular",
+  "contributors": [
+    {
+      "login": "sbryngelson",
+      "name": "Spencer Bryngelson",
+      "avatar_url": "https://avatars.githubusercontent.com/u/39740593?v=4",
+      "profile": "https://github.com/sbryngelson",
+      "contributions": [
+        "code"
+      ]
+    }
+  ],
+  "contributorsPerLine": 7,
+  "linkToUsage": true
+}

README.md

@@ -230,3 +230,34 @@ MFC computations have used many supercomputing systems. A partial list is below
   * PSC Bridges(1/2), NCSA Delta, SDSC Comet and Expanse, Purdue Anvil, TACC Stampede(1-3), and TAMU ACES via ACCESS-CI allocations from Bryngelson, Colonius, Rodriguez, and more.
   * DOD systems Onyx, Carpenter, Nautilus, and Narwhal via the DOD HPCMP program
   * Sandia National Labs systems Doom and Attaway and testbed systems Weaver and Vortex
+
+## 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/sbryngelson"><img src="https://avatars.githubusercontent.com/u/39740593?v=4?s=100" width="100px;" alt="Spencer Bryngelson"/><br /><sub><b>Spencer Bryngelson</b></sub></a><br /><a href="https://github.com/sbryngelson/MFC/commits?author=sbryngelson" title="Code">💻</a></td>
+    </tr>
+  </tbody>
+  <tfoot>
+    <tr>
+      <td align="center" size="13px" colspan="7">
+        <img src="https://raw.githubusercontent.com/all-contributors/all-contributors-cli/1b8533af435da9854653492b1327a23a4dbd0a10/assets/logo-small.svg">
+          <a href="https://all-contributors.js.org/docs/en/bot/usage">Add your contributions</a>
+        </img>
+      </td>
+    </tr>
+  </tfoot>
+</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!