Updated FAQ (markdown)

FAQ.md

@@ -13,6 +13,8 @@ If using `weed filer`, just send one HTTP POST to write, or one HTTP GET to read
 
 If using SeaweedFS for block storage, you may try to reuse some existing libraries.
 
+The internal management APIs are in gRPC. You can generate the language bindings for your own purpose.
+
 ### Does it support FUSE?
 Yes.