Add OWNERS files

Also, change the release.bash script so it doesn't include the OWNERS
file in the release ZIP (nor the .DS_Store files).

Change-Id: I09fc621838714f0620a3efb3a3e4824d9ee60258
diff --git a/docs/OWNERS b/docs/OWNERS
new file mode 100644
index 0000000..a0ecb1c
--- /dev/null
+++ b/docs/OWNERS
@@ -0,0 +1 @@
+per-file *.ru.md=ai@contributor.pw