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/swift/Sources/FlatBuffers/Struct.swift

@@ -0,0 +1,16 @@
+import Foundation
+
+public struct Struct {
+    public private(set) var bb: ByteBuffer
+    public private(set) var postion: Int32
+    
+    public init(bb: ByteBuffer, position: Int32 = 0) {
+        self.bb = bb
+        self.postion = position
+    }
+    
+    public func readBuffer<T: Scalar>(of type: T.Type, at o: Int32) -> T {
+        let r = bb.read(def: T.self, position: Int(o + postion))
+        return r
+    }
+}