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/tests/namespace_test/NamespaceA/NamespaceB/EnumInNestedNS.cs

@@ -0,0 +1,16 @@
+// <auto-generated>
+//  automatically generated by the FlatBuffers compiler, do not modify
+// </auto-generated>
+
+namespace NamespaceA.NamespaceB
+{
+
+public enum EnumInNestedNS : sbyte
+{
+  A = 0,
+  B = 1,
+  C = 2,
+};
+
+
+}