Add Code of Conduct for Open Data Hub

Added a Code of Conduct to promote a respectful and inclusive community.

Author: kadambari25

CODE_OF_CONDUCT.md

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+<!--
+SPDX-FileCopyrightText: NOI Techpark
+SPDX-License-Identifier: CC0-1.0
+-->
+
+# Code of Conduct
+
+Hello everyone,
+
+We’re sharing the Code of Conduct for Open Data Hub to ensure a respectful, inclusive, and collaborative environment for all members. We kindly ask everyone to take a few minutes to carefully review the document linked below and familiarize themselves with the guidelines.
+
+By being part of this community, you agree to follow these principles and help maintain a positive space for everyone.
+
+https://cloud.opendatahub.com/index.php/s/BTiqmMyQM4q45TN