[DRAFT] Add a CODEOWNERS file designating oversight of certain Evolution repo content to relevant teams

.github/CODEOWNERS

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+# Lines starting with '#' are comments.
+# Each line is a case-sensitive file pattern followed by one or more owners.
+# Order is important. The last matching pattern has the most precedence.
+# More information: https://docs.github.com/en/articles/about-code-owners
+#
+# Please mirror the repository's file hierarchy in case-sensitive lexicographic
+# order.
+
+# .github
+/.github/CODEOWNERS @shahmishal @swiftlang/core-team 
+
+
+### Evolution process documentation
+
+# The primary Swift Evolution process documentation file.
+/process.md @rjmccall
+
+
+### Visions
+
+# The top-level "visions" directory.
+#
+# Approval from the Core Team is required to add a new vision document.
+/visions/ @swiftlang/core-team
+
+# Specific vision documents.
+#
+# Owners typically include the primary author(s) and any sponsoring steering
+# group(s) or workgroup(s).
+/visions/swift-testing.md @stmontgomery @swiftlang/testing-workgroup
+
+
+### Proposal templates
+
+# The top-level "proposal-templates" directory.
+#
+# Approval from the Core Team is required to add a new proposal template.
+/proposal-templates/ @swiftlang/core-team
+
+# Specific proposal templates.
+#
+# Owners typically include the steering group(s) or workgroup(s) with authority
+# to conduct reviews of proposals which follow each template.
+/proposal-templates/0000-swift-testing-template.md @swiftlang/testing-workgroup
+
+
+### Proposals
+
+# The top-level "proposals" directory.
+#
+# This does not have a designated owner, so its list is empty.
+/proposals/
+
+# Specific proposal directories.
+#
+# Owners typically include the steering group(s) or workgroup(s) with authority
+# to conduct reviews of proposals placed in each directory.
+/proposals/testing/ @swiftlang/testing-workgroup