Update GoUsers.md adding Mentorink as a user of Go

[mkafkas]

adding Mentorink as the Go User.

[google-cla]

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[mkafkas]

CLA is now in progress

[gopherbot]

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

(1 comment)

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[gopherbot]

Message from Gopher Robot:

Patch Set 1:

Congratulations on opening your first change. Thank you for your contribution!

Next steps:
A maintainer will review your change and provide feedback. See
https://go.dev/doc/contribute#review for more info and tips to get your
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[gopherbot]

Message from Mahmut Kafkas:

Patch Set 1: Code-Review+1

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[gopherbot]

Message from Mahmut Kafkas:

Patch Set 1:

(1 comment)

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[gopherbot]

Message from Ian Lance Taylor:

Patch Set 1:

(2 comments)

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