Add .gitignore file
Create DiMintClient class

currently, DiMintClient's implementation looks like python dict class.
It contains connect, disconnect, get and set public methods.
It also has getitem and setitem methods, so it can be used like dict.
e.g) client[key] = value
Implement get and set data via network

Used zeromq for networking.
Network protocols are arbitrary. It always can be changed.
Create setup.py file