📖 Updated readme with how to create standalone controller-gen binary

[prashao]

Several developers have asked for a way to create standalone controller-gen binary.
See #520, #509 etc.

Hence the README has been updated with instructions on how to generate the standalone binary.

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[prashao]

Review comments incorporated

[prashao]

/assign @camilamacedo86

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[tadayosi]

Hi, why is this not merged yet? @prashao @camilamacedo86

[prashao]

Not sure. I had assigned it to @camilamacedo86 for approval after incorporating the review comments.