chore: update README with apps

Author: AndreaGiulianelli

README.md

@@ -4,4 +4,9 @@
 In order to use this template you need to do the following steps:
 1. modify project name in `settings.gradle.kts`
 2. set up branch protection
-3. set up a Personal Access token and modify it in the `release` job for `semantic release`([more here](https://semantic-release.gitbook.io/semantic-release/recipes/ci-configurations/github-actions#pushing-package.json-changes-to-a-master-branch))
+3. set up a Personal Access token and modify it in the `release` job for `semantic release`([more here](https://semantic-release.gitbook.io/semantic-release/recipes/ci-configurations/github-actions#pushing-package.json-changes-to-a-master-branch))
+
+## Apps to install when used outside this organization
+- Renovate Bot
+- GitGuardian
+- Mergify