Added documentation on styling of Grid

[mikotin]

This change is 

[CLAassistant]

All committers have signed the CLA.

[denis-anisimov]

You should add the code snippets as a validation files ( java, css). See how it's done in other tutorials.
Otherwise the validation fails.

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Reviewed 1 of 1 files at r1.
Review status: 2 unresolved discussions, 0 of 1 LGTMs obtained

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documentation/components/tutorial-flow-grid.asciidoc, line 895 at r1 (raw file):

indigates

typo ?

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documentation/components/tutorial-flow-grid.asciidoc, line 948 at r1 (raw file):

This does not only apply in the text-fields of the grid, but - because date-field uses the text-field internally - also
the date-fields. Now the look and feel of used component - the textfield - is always the same, whether it's directly
used or wrapped within another component.

new line

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Comments from Reviewable

[denis-anisimov]

Reviewed 4 of 4 files at r2.
Review status: 1 unresolved discussion, 0 of 1 LGTMs obtained

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Comments from Reviewable

[ZheSun88]

Review status: 1 unresolved discussion, 0 of 1 LGTMs obtained

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a discussion (no related file):
the build failed because grid cannot find the addThemeName method, should there be a separate PR to implement hasTheme to grid, together with a grid a demo?

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Comments from Reviewable

[ZheSun88]

This will start to build after vaadin/vaadin-grid-flow#245

[ZheSun88]

Reviewable status: 1 unresolved discussion, 0 of 1 LGTMs obtained

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documentation/components/tutorial-flow-grid.asciidoc, line 948 at r1 (raw file):

Previously, denis-anisimov (Denis) wrote…

new line

new line added

[denis-anisimov]

Reviewed 1 of 1 files at r4.
Reviewable status: all discussions resolved, 0 of 1 LGTMs obtained, and 1 stale

[denis-anisimov]

Reviewed 1 of 1 files at r5, 1 of 1 files at r6.
Reviewable status: all discussions resolved, 0 of 1 LGTMs obtained, and 1 stale

[denis-anisimov]

Reviewable status: complete! all discussions resolved, 1 of 1 LGTMs obtained

a discussion (no related file):

Previously, ZheSun88 (Sun Zhe) wrote…

the build failed because grid cannot find the addThemeName method, should there be a separate PR to implement hasTheme to grid, together with a grid a demo?

Should be separate PR, yes.

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