Mention JSON schema (#474)

Co-authored-by: Emily Grace Seville <[email protected]>

docs/Config.md

@@ -12,6 +12,21 @@ Changes to the user config will only take place after closing and re-opening laz
 - Linux: `~/.config/lazydocker/config.yml`
 - Windows: `C:\\Users\\<User>\\AppData\\Roaming\\jesseduffield\\lazydocker\\config.yml` (I think)
 
+JSON schema is available for `config.yml` so that IntelliSense in Visual Studio Code
+(completion and error checking) is automatically enabled when the [YAML Red Hat][yaml]
+extension is installed. However, note that automatic schema detection only works
+if your config file is in one of the standard paths mentioned above. If you
+override the path to the file, you can still make IntelliSense work by adding
+
+```yaml
+# yaml-language-server: $schema=https://json.schemastore.org/lazydocker.json
+```
+
+to the top of your config file or via [Visual Studio Code settings.json config][settings].
+
+[yaml]: https://marketplace.visualstudio.com/items?itemName=redhat.vscode-yaml
+[settings]: https://github.com/redhat-developer/vscode-yaml#associating-a-schema-to-a-glob-pattern-via-yamlschemas
+
 ## Default:
 
 ```yml