Add codeowners file (#342)

Author: sawyerh

CODEOWNERS

@@ -0,0 +1 @@
+@navapbc/platform-frontend

template-only-bin/install-template.sh

@@ -26,3 +26,4 @@ rm .github/workflows/template-only-*
 rm -rf .github/ISSUE_TEMPLATE
 rm -rf docs/decisions/template
 rm docs/decisions/template.md
+rm CODEOWNERS

template-only-bin/update-template.sh

@@ -38,7 +38,8 @@ echo "Applying patch"
 EXCLUDE_OPT="--exclude=.github/workflows/template-only-* \
   --exclude=.github/ISSUE_TEMPLATE \
   --exclude=docs/decisions/template.md \
-  --exclude=docs/decisions/template"
+  --exclude=docs/decisions/template" \
+  --exclude=CODEOWNERS
 git apply $EXCLUDE_OPT --allow-empty template-application-nextjs/patch
 
 echo "Saving new template version to .template-application-nextjs"