extension Sample should have a readme

[KevinLaMS]

Dev Home version

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Windows build number

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Other software

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Steps to reproduce the bug

The extension sample should have a readme file that discusses how to build, modify and test.

C:\Users\kevinla\source\repos\devhome\extensions\SampleExtension

Expected result

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Actual result

nada.

Included System Information

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Included Extensions Information

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