Move docs about native code development into a repo directory.

No-Try: True
Bug: None
Change-Id: I4a7f3df3547beb85eaabe90a9d059da32cc64261
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/151303
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Patrik Höglund <phoglund@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29129}
diff --git a/docs/OWNERS b/docs/OWNERS
new file mode 100644
index 0000000..72e8ffc
--- /dev/null
+++ b/docs/OWNERS
@@ -0,0 +1 @@
+*