docs: add info on how to use input arrays

Author: EndBug

README.md

@@ -72,12 +72,14 @@ That said, you can just copy the example line and not worry about it. If you do
 ### Adding files:
 
 The action adds files using a regular `git add` command, so you can put every kind of argument in the `add` option. For example, if you want to force-add a file: `./path/to/file.txt --force`.  
-The script will not stop if one of the git commands fails. E.g.: if your command shows a "fatal: pathspec 'yourFile' did not match any files" error the action will go on.
+The script will not stop if one of the git commands fails. E.g.: if your command shows a "fatal: pathspec 'yourFile' did not match any files" error the action will go on.  
+You can also use JSON or YAML arrays (e.g. `'["first", "second"]'`, `"['first', 'second']"`) to make the action run multiple `git add` commands: the action will log how your input has been parsed. Please mind that your input still needs to be a string because of how GitHub Actions works with inputs: just write your array inside the string, the action will parse it later.
 
 ### Deleting files:
 
 You can delete files with the `remove` option: that runs a `git rm` command that will stage the files in the given path for removal. As with the `add` argument, you can use every option `git rm` allows (e.g. add `--force` to ignore `.gitignore` rules).  
-The script will not stop if one of the git commands fails. E.g.: if your command shows a "fatal: pathspec 'yourFile' did not match any files" error the action will go on.
+The script will not stop if one of the git commands fails. E.g.: if your command shows a "fatal: pathspec 'yourFile' did not match any files" error the action will go on.  
+You can also use JSON or YAML arrays (e.g. `'["first", "second"]'`, `"['first', 'second']"`) to make the action run multiple `git rm` commands: the action will log how your input has been parsed. Please mind that your input still needs to be a string because of how GitHub Actions works with inputs: just write your array inside the string, the action will parse it later.
 
 ### Tagging:
 
@@ -199,6 +201,7 @@ Thanks goes to these wonderful people ([emoji key](https://allcontributors.org/d
 
 <!-- markdownlint-enable -->
 <!-- prettier-ignore-end -->
+
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
 This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!