Update md files. Add cpp in docs/examples (#1769)

* Update md files. Add cpp in docs/examples

* Normalize all the line endings

* Fix block_id in snippets

* Fix utf-8 encoding

* Add new folder for snippets

* Fix issues with compiling code from snippets

* Added conteiner iterator fix

docs/snippets/InferenceEngine_QueryAPI3.cpp

@@ -0,0 +1,12 @@
+#include <inference_engine.hpp>
+
+int main() {
+using namespace InferenceEngine;
+//! [part3]
+InferenceEngine::Core core;
+auto network = core.ReadNetwork("sample.xml");
+auto exeNetwork = core.LoadNetwork(network, "CPU");
+auto nireq = exeNetwork.GetMetric(METRIC_KEY(OPTIMAL_NUMBER_OF_INFER_REQUESTS)).as<unsigned int>();
+//! [part3]
+return 0;
+}