created interfaces

[garudakang]

has created interface design very simply and written comments its usage. we will append interfaces and methods step by step.

[edwardyoon]

One minor thing, we need to remove @author tags. The ASF recommends against putting @author tags in source code for these reasons:

• Attributions in source files are not up to date.
• Software is a team effort.
• ASF sells the code base as an ASF brand.
• Shield against law-suits.

[garudakang]

removed author tags. thanks

[daengky]

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