Merge VTM readme file with build instructions.

6 jobs for !43 with readme in 5 minutes and 15 seconds (queued for 2 seconds)
latest detached
Status Job ID Name Coverage
  Build
passed #19499
macos
build_macos

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ubuntu1604
build_ubuntu1604

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build_ubuntu1804

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ubuntu1804-gcc8
build_ubuntu1804-gcc8

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vc191x
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vc192x
build_vc192x

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