feat: adds Code Owners + PR template

Author: gberenice

.github/CODEOWNERS

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+# Use this file to define individuals or teams that are responsible for code in a repository.
+# Read more: <https://help.github.com/articles/about-codeowners/>
+#
+# Order is important: the last matching pattern takes the most precedence
+
+# These owners will be the default owners for everything
+*             @masterpointio/masterpoint-internal

.github/PULL_REQUEST_TEMPLATE.md

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+## what
+* Describe high-level what changed as a result of these commits (i.e. in plain-english, what do these changes mean?)
+* Use bullet points to be concise and to the point.
+
+## why
+* Provide the justifications for the changes (e.g. business case). 
+* Describe why these changes were made (e.g. why do these commits fix the problem?)
+* Use bullet points to be concise and to the point.
+
+## references
+* Link to any supporting github issues or helpful documentation to add some context (e.g. stackoverflow). 
+* Use `closes #123`, if this PR closes a GitHub issue `#123`
+