Add library example with C++

Author: termoshtt

examples/cpp/lib/.gitignore

@@ -0,0 +1,2 @@
+# cmake
+build/

examples/cpp/lib/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.16) # default of ubuntu:20.04
+project(ocipkg_example_cpp_lib)
+add_library(ocipkg_static_cpp STATIC lib.cpp)
+install(TARGETS ocipkg_static_cpp ARCHIVE)
+include(CPack)

examples/cpp/lib/lib.cpp

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+#include <iostream>
+
+extern "C" {
+  void hello_from_cpp() {
+    std::cout << "Hello from C++!" << std::endl;
+  }
+}