docs: C & C++ apis examples

Type: docs

Change-Id: I5b6c388332bdd3a29777d728c3357816c8411ea2
Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>
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+.. _cvpp:
+
+============
+C api client
+============
+
+You can find a good example on how to build a binary API client in C here :
+
+`src/vpp-api/vapi/vapi_c_test.c <__REPOSITORY_URL__/src/vpp-api/vapi/vapi_c_test.c>`_
+