[After 4.1] Add a golang solution for the Readers-writers problem from section 4.2#20

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paulofelipefeitosa wants to merge 2 commits intothiagomanel:masterfrom paulofelipefeitosa:readers-writers-4.2

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Commits on May 5, 2021

Add the solution for the Producer-consumer problem from section 4.1
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Add a golang solution for the Readers-writers problem from section 4.2
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