add zstd submodule

richarddavison · richarddavison · commit c88938895bba · 2023-10-27T12:11:58.000+02:00
diff --git a/zstd b/zstd
@@ -0,0 +1 @@
+Subproject commit 63779c798237346c2b245c546c40b72a5a5913fe
