czml-writer architecture guide (czml-writer issue 13)

This is regarding the czml-writer issue #13 [1]. There is no architecture guide for czml-writer as the one we have for cesium. This issue has been there for quite long and it would be highly helpful if this gets resolved. Without the architecture, reading the source code is really difficult. Please look into this matter.

[1] https://github.com/AnalyticalGraphicsInc/czml-writer/issues/13

thank you

regards

Ayudh Das