docs: add tibshirani as a contributor for code, and content (#15)

* docs: update README.md [skip ci]

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

---------

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

.all-contributorsrc

@@ -0,0 +1,27 @@
+{
+  "files": [
+    "README.md"
+  ],
+  "imageSize": 100,
+  "commit": false,
+  "commitType": "docs",
+  "commitConvention": "angular",
+  "contributors": [
+    {
+      "login": "tibshirani",
+      "name": "tibshirani",
+      "avatar_url": "https://avatars.githubusercontent.com/u/2848609?v=4",
+      "profile": "https://github.com/tibshirani",
+      "contributions": [
+        "code",
+        "content"
+      ]
+    }
+  ],
+  "contributorsPerLine": 7,
+  "skipCi": true,
+  "repoType": "github",
+  "repoHost": "https://github.com",
+  "projectName": "ISLP_labs",
+  "projectOwner": "intro-stat-learning"
+}

README.md

@@ -1,4 +1,7 @@
 # ISLP_labs
+<!-- ALL-CONTRIBUTORS-BADGE:START - Do not remove or modify this section -->
+[![All Contributors](https://img.shields.io/badge/all_contributors-1-orange.svg?style=flat-square)](#contributors-)
+<!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 ## Authors
 
@@ -32,3 +35,25 @@ jupyter lab Ch02-statlearning-lab.ipynb
 
 You can download all the labs as a `.zip` or `.tar.gz` [here](https://github.com/intro-stat-learning/ISLP_labs/releases/tag/v2.1.3)
 
+
+## 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/tibshirani"><img src="https://avatars.githubusercontent.com/u/2848609?v=4?s=100" width="100px;" alt="tibshirani"/><br /><sub><b>tibshirani</b></sub></a><br /><a href="https://github.com/intro-stat-learning/ISLP_labs/commits?author=tibshirani" title="Code">💻</a> <a href="#content-tibshirani" title="Content">🖋</a></td>
+    </tr>
+  </tbody>
+</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!