Configure codeowners and PR template (#2)

Signed-off-by: Sergii Leshchenko <[email protected]>

Author: sleshchenko

.github/CODEOWNERS

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+# Global Owners
+* @sleshchenko @amisevsk

.github/PULL_REQUEST_TEMPLATE.md

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+### What does this PR do?
+
+
+### What issues does this PR fix or reference?
+
+
+### Is your PR tested? Consider putting some instruction how to test your changes
+
+
+#### Docs PR
+<!-- Please add a matching PR to [the docs repo](https://github.com/eclipse/che-docs) and link that PR to this issue.
+Both will be merged at the same time. -->