docs: C & C++ apis examples

Type: docs

Change-Id: I5b6c388332bdd3a29777d728c3357816c8411ea2
Signed-off-by: Nathan Skrzypczak <nathan.skrzypczak@gmail.com>
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+.. _cppvpp:
+
+==============
+C++ api client
+==============
+
+This describes how to write a C++ api client connecting to VPP's binary API.
+
+Connecting to VPP is done with :
+
+::
+
+    auto err = con.connect("example_client", nullptr, 32, 32);
+
+
+You can specify the path to the api socket/shared memory you want to connect to
+with the second parameter (set to ``nullptr``, meaning default)
+
+.. literalinclude:: ./api_example/api_example.cc
+  :language: cpp
+
+To build this you could use the following makefile
+
+.. literalinclude:: ./api_example/Makefile
+  :language: makefile
+