Add example for interoperability between c++ and java-binding applications

[karczex]

Add example for interoperability between c++ and java-binding applications

Description

It would be useful to add example (and test) for such scenario:

• Create db with pmempool tool
• Insert data to db in C++ application - Example should be simple, so UTF-8 encoded strings would be sufficient
• Read and display data from db in java application