Merge go microservices example with the existing one.#2

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rsergiuistoc wants to merge 4 commits intogerzse:masterfrom rsergiuistoc:master

Commits on Aug 3, 2019

Added standard project structure for services
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Commits on Aug 4, 2019

Added serialization model for user and the controller methods
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Commits on Aug 7, 2019

Added functionality for getting all users and client application
rsergiuistoc
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Commits on Aug 10, 2019

Finished photo service and client exe
rsergiuistoc
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