Create CODEOWNERS.

Closes https://github.com/bazelbuild/rules_typescript/pull/393.

PiperOrigin-RevId: 231790200
diff --git a/CODEOWNERS b/CODEOWNERS
new file mode 100644
index 0000000..b1485d0
--- /dev/null
+++ b/CODEOWNERS
@@ -0,0 +1 @@
+* @mgechev @kyliau @alexeagle
\ No newline at end of file