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Update C-API with working example (#503)

* Add working example of C-API

* Section formatting

* Shortened example, and grouped by functionality

* Update C_API.md
J
jignparm committed
bdf72ad5e3d30607a94b65c6690fa4749cc44551
Parent: 0b841c3
Committed by GitHub <noreply@github.com> on 2/26/2019, 3:06:51 AM