MAINT: updated github PR templates

.github/pull_request_template.md

@@ -1,7 +1,13 @@
-# Description
-Please include a summary of the change. For large or complex changes please include enough information to introduce your change and explain motivation for it.
+### Description 
+_Add a comprehensive description of proposed changes_
 
-Changes proposed in this pull request:
--
--
--
+Fixes # - _issue number(s) if exists_
+
+- [ ] I have reviewed my changes thoroughly before submitting this pull request.
+- [ ] I have commented my code, particularly in hard-to-understand areas.
+- [ ] I have updated the documentation to reflect the changes, if necessary (updated in # - _add PR number_)
+- [ ] The unit tests pass successfully.
+- [ ] I have run it locally and tested the changes extensively.
+- [ ] I have resolved any merge conflicts that might occur with the base branch.
+- [ ] Git commit message contains an appropriate signed-off-by string _(see [CONTRIBUTING.md](https://github.com/oneapi-src/oneDAL/blob/main/CONTRIBUTING.md#pull-requests) for details)_
+- [ ] I have added a respective label(s) to PR if I have a permission for that.