add flatbuffers

commit 6da1cf79d90eb242e7da5318241d42279a3df3ba
Author: Max Burke <max@urbanlogiq.com>
Date:   Sun Jan 19 14:47:28 2020 -0800

    [rust] Add use declarations to Rust-generated bindings for imported FB definitions (#5645)

    * Bugfix for Rust generation of union fields named with language keywords

flatbuffers/go/struct.go

@@ -0,0 +1,8 @@
+package flatbuffers
+
+// Struct wraps a byte slice and provides read access to its data.
+//
+// Structs do not have a vtable.
+type Struct struct {
+	Table
+}