Add invoice for @JounQin

Closes GH-56.

Reviewed-by: Titus Wormer <tituswormer@gmail.com>
Reviewed-by: Merlijn Vos <merlijn@soverin.net>
Reviewed-by: Christian Murphy <christian.murphy.42@gmail.com>

invoices/invoices/2022-07-17-JounQin.md

@@ -0,0 +1,18 @@
+# Invoice: unified collective
+
+- **Date**: 2022-07-17
+- **Person**: Jiaren Liu ([@JounQin](https://github.com/JounQin))
+
+## Items
+
+| Item                 | Description                                  | Total     |
+| -------------------- | -------------------------------------------- | --------- |
+| unifiedjs/collective | eslint-mdx development and support v1 and v2 | **$5000** |
+
+---
+
+These numbers are since the init commit, which was on 2019-07-29.
+
+- **Commits**: [220](https://github.com/search?l=&q=author%3AJounQin+committer-date%3A%222019-07-29..2022-06-30%22+repo%3Amdx-js%2Feslint-mdx&type=commits)
+- **Issues and PRs**: [99](https://github.com/search?l=&q=author%3AJounQin+committer-date%3A%222019-07-29..2022-06-30%22+repo%3Amdx-js%2Feslint-mdx+is%3Aissue&type=issues)
+- **Reviews**: [28](https://github.com/search?q=reviewed-by%3AJounQin+created%3A%222019-07-29..2022-06-30%22+repo%3Amdx-js%2Feslint-mdx)