How to contact maintainers + some clarifications (#2822)

* adding slack link

* contacting maintainers

* Updating details on bazel tests

* Apply suggestions from code review

Co-authored-by: ethanglaser <[email protected]>

* Apply suggestions from code review

Co-authored-by: ethanglaser <[email protected]>

* Update CONTRIBUTING.md

* Update CONTRIBUTING.md

---------

Co-authored-by: ethanglaser <[email protected]>

CONTRIBUTING.md

@@ -23,6 +23,14 @@ We welcome community contributions to Intel(R) oneAPI Data Analytics Library. Yo
 
 Refer to our guidelines on [pull requests](#pull-requests) and [issues](#issues) before you proceed.
 
+## Contacting maintainers
+You may reach out to Intel project maintainers privately at [email protected].
+[Codeowners](https://github.com/oneapi-src/oneDAL/blob/main/.github/CODEOWNERS) configuration defines specific maintainers for corresponding code sections, however it's currently limited to Intel members. With further migration to UXL we will be changing this, but here are non-Intel contacts: 
+
+For ARM specifics you may contact: [@rakshithgb-fujitsu](https://github.com/rakshithgb-fujitsu/)
+
+For RISC-V specifics you may contact: [@keeranroth](https://github.com/keeranroth/)
+
 ## Issues
 
 Use [GitHub issues](https://github.com/oneapi-src/oneDAL/issues) to:
@@ -35,8 +43,9 @@ Use [GitHub issues](https://github.com/oneapi-src/oneDAL/issues) to:
 
 To contribute your changes directly to the repository, do the following:
 - Make sure you can build the product and run all the examples with your patch.
+- Product uses bazel for validation and your changes should pass tests. Please add new tests as necessary. [Bazel Guide for oneDAL](https://github.com/oneapi-src/oneDAL/tree/main/dev/bazel)
 - Make sure your code is in line with our [coding style](#code-style) as `clang-format` is one of the checks in our public CI.
-- For a larger feature, provide a relevant example.
+- For a larger feature, provide a relevant example, and tests.
 - [Document](#documentation-guidelines) your code.
 - [Submit](https://github.com/oneapi-src/oneDAL/pulls) a pull request into the `main` branch.
 

README.md

@@ -132,7 +132,11 @@ To report a vulnerability, refer to [Intel vulnerability reporting policy](https
 
 ### Contribute <!-- omit in toc -->
 
-We welcome community contributions. Check our [contributing guidelines](CONTRIBUTING.md) to learn more.
+We welcome community contributions. Check our [contributing guidelines](CONTRIBUTING.md) to learn more. You can also contact the oneDAL team via [UXL Foundation Slack] using
+[#onedal] channel.
+
+[UXL Foundation Slack]: https://slack-invite.uxlfoundation.org/
+[#onedal]: https://uxlfoundation.slack.com/channels/onedal
 
 ## License <!-- omit in toc -->