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/samples/lua/MyGame/Sample/Vec3.lua

@@ -0,0 +1,35 @@
+-- automatically generated by the FlatBuffers compiler, do not modify
+
+-- namespace: Sample
+
+local flatbuffers = require('flatbuffers')
+
+local Vec3 = {} -- the module
+local Vec3_mt = {} -- the class metatable
+
+function Vec3.New()
+    local o = {}
+    setmetatable(o, {__index = Vec3_mt})
+    return o
+end
+function Vec3_mt:Init(buf, pos)
+    self.view = flatbuffers.view.New(buf, pos)
+end
+function Vec3_mt:X()
+    return self.view:Get(flatbuffers.N.Float32, self.view.pos + 0)
+end
+function Vec3_mt:Y()
+    return self.view:Get(flatbuffers.N.Float32, self.view.pos + 4)
+end
+function Vec3_mt:Z()
+    return self.view:Get(flatbuffers.N.Float32, self.view.pos + 8)
+end
+function Vec3.CreateVec3(builder, x, y, z)
+    builder:Prep(4, 12)
+    builder:PrependFloat32(z)
+    builder:PrependFloat32(y)
+    builder:PrependFloat32(x)
+    return builder:Offset()
+end
+
+return Vec3 -- return the module