OWNERS: Add `Thu Nguyen` as a reviewer

I have been actively contributing to OpenBMC/pldm source, especially for
`platform-mc/` folder. Attached is a summary of my contributions to
the repository [1].

I would like to learn and help out on pldm reviews.

[1] https://github.com/openbmc/pldm/commits?author=ThuBaNguyen

Signed-off-by: Thu Nguyen <thu@os.amperecomputing.com>
Change-Id: I2e9b769bacff96c91a0f2f211a1a3b4c41bc9411
diff --git a/OWNERS b/OWNERS
index 644ceda..162f7ac 100644
--- a/OWNERS
+++ b/OWNERS
@@ -39,6 +39,7 @@
 reviewers:
 - liuxiwei@ieisystem.com
 - pavithrabarithaya07@gmail.com
+- thu@os.amperecomputing.com
 
 matchers:
 - partial_regex: ibm
@@ -70,3 +71,6 @@
 - name: Pavithra Barithaya
   email: pavithrabarithaya07@gmail.com
   discord: Pavithra B
+- name: Thu Nguyen
+  email: thu@os.amperecomputing.com
+  discord: Thu Nguyen