Dbgpt

fix same bugs

What's changed
1. add lora fine-turning for llama/llama2 zhanghy-sketchzh
2. support qlora fine-turning for llama2 zhanghy-sketchzh
3. add a solution for multi-gpu cards. wangzaistone
4. add prediction demo. 1ring2rta

What's Changed
1. init readme.md and readme.zh.md csunny zhanghy-sketchzh
2. Spider + QLoRA + Falcon SFT scaffold zhanghy-sketchzh
3. readme.md grammar correction csunny