hydrogen-web/doc/viewhierarchy.md

view hierarchy:
```
    BrawlView
        SwitchView
            SessionView
                SyncStatusBar
                ListView(left-panel)
                SwitchView
                    RoomPlaceholderView
                    RoomView
                        MiddlePanel
                            ListView(timeline)
                            ComposerView
                        RightPanel
            SessionStartView
                SessionPickView
                LoginView
```
refine ui prototype and document planned view hierarchy 2019-06-15 05:06:52 +05:30			`view hierarchy:`
			```
			`BrawlView`
			`SwitchView`
			`SessionView`
update viewhierarchy doc 2019-06-16 20:11:17 +05:30			`SyncStatusBar`
refine ui prototype and document planned view hierarchy 2019-06-15 05:06:52 +05:30			`ListView(left-panel)`
			`SwitchView`
			`RoomPlaceholderView`
			`RoomView`
			`MiddlePanel`
			`ListView(timeline)`
			`ComposerView`
			`RightPanel`
update viewhierarchy doc 2019-06-16 20:11:17 +05:30			`SessionStartView`
			`SessionPickView`
			`LoginView`
refine ui prototype and document planned view hierarchy 2019-06-15 05:06:52 +05:30			```