Add C++ Prometheus Exporter Example Program#310

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erichsueh3 wants to merge 6 commits into

open-telemetry:masterfrom

erichsueh3:example

Commits on Aug 31, 2020

added prometheus example
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Commits on Sep 2, 2020

Merge https://github.com/open-telemetry/opentelemetry-cpp into example
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changed endl to \n, added anonymous namespace, removed unneeded else statement
erichsueh3
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made aggregator choice a command line argument, and modified README to reflect changes
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Commits on Sep 3, 2020

minor README changes
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argc check
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