docs: added contributors

.all-contributorsrc

@@ -0,0 +1,24 @@
+{
+  "files": [
+    "CONTRIBUTORS.md"
+  ],
+  "imageSize": 100,
+  "commit": false,
+  "contributors": [
+    {
+      "login": "jonrkarr",
+      "name": "Jonathan Karr",
+      "avatar_url": "https://avatars.githubusercontent.com/u/2848297?v=4",
+      "profile": "https://www.karrlab.org",
+      "contributions": [
+        "code"
+      ]
+    }   
+  ],
+  "contributorsPerLine": 7,
+  "projectName": "Biosimulators_XPP",
+  "projectOwner": "biosimulators",
+  "repoType": "github",
+  "repoHost": "https://github.com",
+  "skipCi": true
+}

CONTRIBUTORS.md

@@ -0,0 +1,22 @@
+# Contributors
+
+BioSimulators-XPP was developed with help from the following people:
+
+<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
+<!-- prettier-ignore-start -->
+<!-- markdownlint-disable -->
+<table>
+  <tr>
+    <td align="center"><a href="https://www.karrlab.org"><img src="https://avatars.githubusercontent.com/u/2848297?v=4?s=100" width="100px;" alt=""/><br /><sub><b>Jonathan Karr</b></sub></a><br /><a href="https://github.com/biosimulators/Biosimulators_utils/commits?author=jonrkarr" title="Code">💻</a></td>
+  </tr>
+</table>
+
+<!-- markdownlint-restore -->
+<!-- prettier-ignore-end -->
+
+<!-- ALL-CONTRIBUTORS-LIST:END -->
+
+A key to these emojis is available [here](https://allcontributors.org/docs/en/emoji-key).
+
+## Contributing to BioSimulators-XPP
+We enthusiastically welcome contributions! Please see the [guide to contributing](CONTRIBUTING.md) and the [developer's code of conduct](CODE_OF_CONDUCT.md). 

README.md

@@ -2,6 +2,7 @@
 [![PyPI](https://img.shields.io/pypi/v/biosimulators_xpp)](https://pypi.org/project/biosimulators_xpp/)
 [![CI status](https://github.com/biosimulators/Biosimulators_XPP/workflows/Continuous%20integration/badge.svg)](https://github.com/biosimulators/Biosimulators_XPP/actions?query=workflow%3A%22Continuous+integration%22)
 [![Test coverage](https://codecov.io/gh/biosimulators/Biosimulators_XPP/branch/dev/graph/badge.svg)](https://codecov.io/gh/biosimulators/Biosimulators_XPP)
+[![All Contributors](https://img.shields.io/github/all-contributors/biosimulators/Biosimulators_XPP/HEAD)](#contributors-)
 
 # BioSimulators-XPP
 BioSimulators-compliant command-line interface to the [XPP](http://www.math.pitt.edu/~bard/xpp/xpp.html) simulation program.
@@ -69,7 +70,7 @@ Documentation is available at https://docs.biosimulators.org/Biosimulators_XPP/.
 This package is released under the [MIT license](LICENSE).
 
 ## Development team
-This package was developed by the [Center for Reproducible Biomedical Modeling](http://reproduciblebiomodels.org) and the [Karr Lab](https://www.karrlab.org) at the Icahn School of Medicine at Mount Sinai in New York.
+This package was developed by the [Center for Reproducible Biomedical Modeling](http://reproduciblebiomodels.org) and the [Karr Lab](https://www.karrlab.org) at the Icahn School of Medicine at Mount Sinai in New York with assistance from the contributors listed [here](CONTRIBUTORS.md).
 
 ## Questions and comments
 Please contact the [BioSimulators Team](mailto:[email protected]) with any questions or comments.