Create contributor onboarding issue template

Added a contributor onboarding template for new contributors to introduce themselves and specify their interests.

Author: ajay-dhangar

.github/ISSUE_TEMPLATE/contributor_onboarding.yml

@@ -0,0 +1,37 @@
+name: Contributor Onboarding
+description: New contributors can introduce themselves and get started
+title: "[Introduction]: Your Name"
+labels:
+  - contributor
+  - onboarding
+assignees:
+  - ajay-dhangar
+body:
+  - type: markdown
+    attributes:
+      value: |
+        ## Welcome to CodeHarborHub!
+
+        Introduce yourself and share what you'd like to work on.
+  - type: input
+    id: name
+    attributes:
+      label: Name / Username
+      placeholder: e.g., Ajay Dhangar / ajay-dhangar
+  - type: dropdown
+    id: interest
+    attributes:
+      label: Area of Interest
+      options:
+        - Frontend Development
+        - Backend Development
+        - AI / ML
+        - Documentation
+        - UI/UX Design
+        - Community Management
+        - Open Source
+  - type: textarea
+    id: goal
+    attributes:
+      label: What do you want to learn or contribute?
+      placeholder: e.g., I want to contribute to AI tutorials or web development tools.