add api usage examples for cpp and python binding

examples/cpp_api_example/data/example.cpp

@@ -0,0 +1,24 @@
+
+/*
+ * MyType
+ *
+ * This is a multiline comment
+ */
+
+namespace api
+{
+
+class MyType
+    : public BaseType
+{
+public:
+    void my_method(bool do_send_signal) const
+    {
+        if (do_send_signal)
+        {
+            Client::send_signal();
+        }
+    }
+}
+
+}