Add chatLLaMa script (#198)
* Add chatLLaMa script
* Fix shellcheck errors and do some cleanup
* Move chatLLaMa script to `examples` directory
* Reduce chatLLaMa context size to 2048
Ref d7def1a7524f712e5ebb7cd02bab0f13aa56a7f9
* Include n_predict to 2048 in examples/chatLLaMa
