feat(plugins/community/splatoon): add plugin (#1287)

source/plugins/community/splatoon/README.md

@@ -0,0 +1,25 @@
+<!--header-->
+<!--/header-->
+
+## ➡️ Available options
+
+<!--options-->
+<!--/options-->
+
+## 🗝️ Obtaining a *Nintendo Switch Online* token
+
+The helper script is intended to be run by [deno runtime](https://deno.land/). Either [install it locally](https://deno.land/manual/getting_started/installation) or use its [docker image](https://hub.docker.com/r/denoland/deno).
+
+Run the following command in your terminal and follow instructions:
+```bash
+deno run --allow-run=deno --allow-read=profile.json --allow-write=profile.json --unstable https://raw.githubusercontent.com/lowlighter/metrics/master/source/plugins/community/splatoon/token.ts
+```
+
+![Script](/.github/readme/imgs/plugin_splatoon_script.png)
+
+![Authentication](/.github/readme/imgs/plugin_splatoon_auth.png)
+
+## ℹ️ Examples workflows
+
+<!--examples-->
+<!--/examples-->