update gitignore; add gigaspeech

examples/dataset/aidatatang_200zh/.gitignore

 *.tgz
 manifest.*
 *.meta
-aidatatang_200zh/
+aidatatang_200zh/
\ No newline at end of file

examples/dataset/aishell/.gitignore

 data_aishell*
+*.meta
+manifest.*
+*.tgz
\ No newline at end of file

examples/dataset/gigaspeech/.gitignore

+GigaSpeech/

examples/dataset/gigaspeech/README.md

+# [GigaSpeech](https://github.com/SpeechColab/GigaSpeech)
+
+```
+git clone https://github.com/SpeechColab/GigaSpeech.git
+
+cd GigaSpeech
+utils/gigaspeech_download.sh /disk1/audio_data/gigaspeech
+toolkits/kaldi/gigaspeech_data_prep.sh --train-subset XL /disk1/audio_data/gigaspeech ../data
+cd ..
+```

examples/dataset/gigaspeech/gigaspeech.py

+# Copyright (c) 2021 PaddlePaddle Authors. 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.

examples/dataset/gigaspeech/run.sh

+#!/bin/bash
+
+set -e
+
+curdir=$PWD
+
+test -d GigaSpeech || git clone https://github.com/SpeechColab/GigaSpeech.git
+cd GigaSpeech
+source env_vars.sh
+utils/gigaspeech_download.sh ${curdir}/

examples/dataset/librispeech/.gitignore

@@ -5,3 +5,5 @@ test-other
 train-clean-100
 train-clean-360
 train-other-500
+*.meta
+manifest.*

examples/dataset/mini_librispeech/.gitignore

@@ -2,3 +2,4 @@ dev-clean/
 manifest.dev-clean
 manifest.train-clean
 train-clean/
+*.meta

examples/dataset/thchs30/.gitignore

@@ -3,3 +3,4 @@ manifest.*
 data_thchs30
 resource
 test-noise
+*.meta