chore: add codeowner template (#1)

.github/CODEOWNERS

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+* @pagopa/io-wallet

.github/pull_request_template.md

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+### Short description
+
+<!--- Please always add a PR description as if nobody knows anything about the context these changes come from. -->
+<!--- Even if we are all from our internal team, we may not be on the same page. -->
+<!--- Write this PR as you were contributing to a public OSS project, where nobody knows you and you have to earn their trust. -->
+<!--- This will improve our projects in the long run! Thanks. -->
+
+#### List of Changes
+
+<!--- Describe your changes in detail -->
+
+#### How Has This Been Tested?
+
+<!--- Please describe in detail how you tested your changes. -->
+<!--- Include details of your testing environment, tests ran to see how -->
+<!--- your change affects other areas of the code, etc. -->
+
+#### Screenshots (if appropriate):
+
+<!--- Attach screenshots in case changes impact UI. -->