docs: add jq (JSON processor) contributor requirement

Author: MikeMcC399

CONTRIBUTING.md

@@ -50,6 +50,7 @@ To contribute to this repo, install:
 - [git](https://git-scm.com/)
 - [Docker](https://docs.docker.com/get-started/get-docker/)
 - [Node.js](https://nodejs.org/en/download) LTS version as specified in [.node-version](./.node-version)
+- [jq](https://jqlang.org/download/)
 
 [fork](https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/working-with-forks/fork-a-repo) and [clone](https://docs.github.com/en/repositories/creating-and-managing-repositories/cloning-a-repository) this repo, then install npm dependencies.
 Replace `<my-github-username>` with the username of your fork in the instructions below: