Add PHPDoc refs #440: Tidy up README.md
Add use statement in example scritps refs #440: Tidy up README.md
Tidy up README.md refs #440: Tidy up README.md
Merge branch 'feature/tidy-up-readme' into develop
Merge branch 'develop' into 'master'

To release

* Add PHPDoc
* Add *INSTALL* section in `README.md`
Bump up the version refs #440: Tidy up README.md
Add CHANGELOG.md refs #440 Tidy up README.md
Merge branch 'release/v0.1.0' into 'master'

Release/v0.1.0

Including the followings:

* Bump up the version
* Add `CHANGELOG.md`