Add all contributors section

README.md

@@ -117,3 +117,14 @@ The average carbon intensity data from Ember is published under the Creative Com
 The marginal intensity data is published by the Green Web Foundation, under the Creative Commons ShareAlike Attribution Licence ([CC BY-SA 4.0](https://creativecommons.org/licenses/by-sa/4.0/)). ([What does this mean?](https://www.tldrlegal.com/license/creative-commons-attribution-share-alike-cc-sa))
 
 See LICENCE for more.
+
+## Contributors
+
+<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section -->
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+<!-- markdownlint-restore -->
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+<!-- ALL-CONTRIBUTORS-LIST:END -->