[DOCS] Add welcome section for new contributors in CONTRIBUTING.md

CONTRIBUTING.md

@@ -1,3 +1,38 @@
+# Welcome New Contributors
+
+Thank you for your interest in contributing to Apache Spark.
+
+If you are new to the project, here are some resources to help you get started:
+
+- Contributors documentation:  
+  https://spark.apache.org/contributing.html
+
+- Create a development environment for working on Spark:  
+  https://spark.apache.org/docs/latest/building-spark.html
+
+- Contributing to the documentation:  
+  See the `docs/` directory in this repository.
+
+- Contributing to the codebase:  
+  See the “Contributing code changes” section below.
+
+- Helping with issue triage:
+  - GitHub Issues: https://github.com/apache/spark/issues
+  - https://issues.apache.org/jira/projects/SPARK
+
+Please also consider joining the Spark developer community via the `dev@spark.apache.org` mailing list.
+
+If something is unclear or does not go smoothly, you can ask on the dev mailing list or comment on the related JIRA issue or GitHub issue.
+
+## Looking for a Place to Begin?
+
+- Consider documentation improvements or small bug fixes.
+- Look for JIRA issues labeled "starter".
+- Comment on a JIRA issue if you plan to work on it.
+- If unsure, ask on the mailing list before starting large changes.
+
+Contributions of all kinds are welcome, including documentation, tests, reviews, issue triage, and code.
+
 ## Contributing to Spark
 
 *Before opening a pull request*, review the