added layout widget content to the readme.md#9

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ImashiAD wants to merge 4 commits intoColombo-Flutter-Meetup:masterfrom

ImashiAD:master

Commits on Oct 19, 2019

added content to the read.md
[imashi921]
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styled previous content
[imashi921]
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pick affc3bb added more widget layout content
[imashi921]
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Commits on Oct 20, 2019

added basic widget content
[imashi921]
committed