.github: Add CODEOWNERS file

Change-Id: Ia763b91177f1ae09d16e5968bed17b0dba62cbe5
Signed-off-by: Kent Russell <kent.russell@amd.com>

.github/CODEOWNERS

@@ -0,0 +1,8 @@
+# Default code owners
+@kentrussell @fxkamd @dayatsin-amd
+
+*.md @ROCm/rocm-documentation @kentrussell @dayatsin-amd
+*.rst @ROCm/rocm-documentation @kentrussell @dayatsin-amd
+
+# Header directory for Doxygen documentation
+inc/* @ROCm/rocm-documentation @kentrussell @fxkamd @dayatsin-amd