* add tutorials

* yapf

* yapf

* copyright

* yapf

* update tutorial lesson5

* delete drawing code

* yapf

* remove action_mapping

* update dqn and add README

* update

* update

* yapf

* add simple dqn

* Update README.md

* Update train.py

* update

* update image in README

* update readme

* simplify

* yapf

* Update README.md

* Update README.md

* Update README.md

* Update train.py

* yapf

* remove previous algorithms; use the forward function in parl.Model

* remove abundant lines

* yapf

* intra-version: move parl.framework into parl.core.fluid

* add folder: parl.core

* remove former test folders

* yapf

* yapf0.24

* add QuickStart example, refine DQN example

* add examples link

* refine the naming, and add quick start training result

* add logger module

* refine comment

* add license

* refine set_level api

* refine unittest

* fix codestyle with yapf

* add termcolor dependency

* fix wrapper of dynamic_lstm cannot support h_0 and c_0 initialization, fix bug of wrapper of dynamic_gru

* use sampling_id of fluid to sampling ids

* remove test simple games unittest, avoid timeout

* change pip source