No document

[halueda]

There should be documents for:

• what this do
• how to use
• how to write configuration file

Possibly both in English and Japanese.

[halueda]

At least following is necessary.

• readme first
• start up guide
• reference manual: command argument about configuration file
• specification: special files, some concept, module abstract and entry point of code

[halueda]

This issue is too big.
An issue should be submitted for each document/language