Update README.md

[pixiedevpraveen]

Correct the numbering In README.md from line 60 to 76 and Add another line of statement.

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[samtstern]

@pixiedevpraveen actually there's nothing wrong with that numbering, you can see it renders correctly:
https://github.com/playgameservices/cpp-android-basic-samples#build-on-windows-using-gradle

In markdown you can use 1. for all numbers and it renders correctly. This is on purpose, that way you can add and remove steps without re-doing all numbers. It's sort of like <ol><li> in HTML.