Add repository map for new CHAOSS contributors

repo-map-for-newcomers.md

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+# CHAOSS Repository Map for New Contributors
+
+The CHAOSS GitHub organization hosts several repositories, each focused on a specific part of community health analytics. This guide helps new contributors quickly identify where they can start based on their interests and experience level.
+
+## Where to Contribute
+
+### Community processes, governance, and contributor onboarding
+
+If you are new to CHAOSS or open source contributions, this is the best place to begin.
+
+- **community**  
+  https://github.com/chaoss/community
+
+This repository contains contribution guidelines, governance documents, mentoring information, and general discussions. Documentation improvements and onboarding-related contributions are especially welcome here.
+
+### Research, metrics, and data science work
+
+For contributors interested in understanding, defining, and analyzing community health metrics:
+
+- **wg-data-science**  
+  https://github.com/chaoss/wg-data-science
+
+This repository focuses on metric definitions, research discussions, and data science approaches used across CHAOSS projects.
+
+### Data collection tools and infrastructure
+
+For contributors who want to work on tooling and backend systems used to collect community data:
+
+- **grimoirelab-perceval**  
+  https://github.com/chaoss/grimoirelab-perceval
+
+- **grimoirelab-sirmordred**  
+  https://github.com/chaoss/grimoirelab-sirmordred
+
+These repositories are part of the GrimoireLab toolchain and handle data collection and processing from multiple platforms such as GitHub, GitLab, and Bugzilla.
+
+## Getting Started Tips
+
+New contributors are encouraged to start with documentation updates, small fixes, or discussion-based contributions before moving on to larger code changes. Reviewing open issues labeled as “good first issue” or “documentation” is a great way to become familiar with the project structure and workflows.