chore(docs):Add Dependabot badge to README

Author: novica

README.md

@@ -3,6 +3,7 @@
 [![CI](https://github.com/novica/r-project-template/actions/workflows/ci.yml/badge.svg)](https://github.com/novica/r-project-template/actions/workflows/ci.yml)
 [![release](https://github.com/novica/r-project-template/actions/workflows/release-please.yml/badge.svg)](https://github.com/novica/r-project-template/actions/workflows/release-please.yml)
 [![docs (Quartrify)](https://github.com/novica/r-project-template/actions/workflows/generate-docs.yml/badge.svg)](https://github.com/novica/r-project-template/actions/workflows/generate-docs.yml)
+[![Dependabot](https://img.shields.io/github/issues-search?query=repo%3Anovica%2Fr-project-template%20is%3Apr%20author%3Aapp%2Fdependabot%20is%3Aopen&label=Dependabot%20PRs)](https://github.com/novica/r-project-template/issues?q=is%3Apr%20is%3Aopen%20author%3Aapp%2Fdependabot)
 [![rv](https://img.shields.io/badge/-rv-000000?logo=r&logoColor=white&labelColor=276DC3)](https://github.com/A2-ai/rv)
 [![air](https://img.shields.io/badge/-air-000000?logo=r&logoColor=white&labelColor=276DC3)](https://github.com/posit-dev/air/)
 [![jarl](https://img.shields.io/badge/-jarl-000000?logo=r&logoColor=white&labelColor=276DC3)](https://github.com/etiennebacher/jarl/)