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/dart_sample.sh

@@ -0,0 +1,52 @@
+#!/bin/bash
+#
+# Copyright 2018 Dan Field. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# Note: This script runs on Mac and Linux. It requires `Node.js` to be installed
+# and `flatc` to be built (using `cmake` in the root directory).
+
+sampledir=$(cd $(dirname $BASH_SOURCE) && pwd)
+rootdir=$(cd $sampledir/.. && pwd)
+currentdir=$(pwd)
+
+if [[ "$sampledir" != "$currentdir" ]]; then
+  echo Error: This script must be run from inside the $sampledir directory.
+  echo You executed it from the $currentdir directory.
+  exit 1
+fi
+
+cd ../dart/example
+
+# Run `flatc`. Note: This requires you to compile using `cmake` from the
+# root `/flatbuffers` directory.
+if [ -e ../../flatc ]; then
+  ../../flatc --dart ../../samples/monster.fbs
+elif [ -e ../../Debug/flatc ]; then
+  ../../Debug/flatc --dart ../../samples/monster.fbs
+else
+  echo 'flatc' could not be found. Make sure to build FlatBuffers from the \
+       $rootdir directory.
+  exit 1
+fi
+
+echo Running the Dart sample.
+
+# Execute the sample.
+dart example.dart
+
+# Cleanup temporary files.
+git checkout monster_my_game.sample_generated.dart
+
+cd ../../samples