fixed typo and revise
Merge pull request #14 from nttsoft/chapter_testing

fixed typo and refine some expressions (testing.gdoc)
translated section 6.1(QuickStartGuide).
remove unnecessary spaces.
Merge pull request #15 from def-my/6-pr-QuickStartGuide

translated section 6.1(QuickStartGuide).
Translated 10.3
コメント反映
translated 6.1.1 basicCRUD.
Merge pull request #16 from def-my/pr-basicCRUD

translated 6.1.1 basicCRUD.
translated 6.2 domainClasses.
Merge pull request #17 from def-my/pr-domainClasses

translated 6.2 domainClasses.
translated 6.2.1 gormAssociation.
Merge pull request #18 from def-my/gormAssociation

translated 6.2.1 gormAssociation.
translate security/codec.gdoc
Merge pull request #20 from nttsoft/testing/functionalTesting

Translated Section 10.3 functional testing
translate security/authentication.gdoc
translate securityPlugins.gdoc
translate security.gdoc
Merge pull request #23 from kmaehashi/security/codecs

translate security/codec.gdoc
Merge pull request #24 from kmaehashi/security/securityPlugins

translate securityPlugins.gdoc