Add security warnings and safe usage guide to README#14

NiSaNo70 wants to merge 1 commit intollSourcell:mainllSourcell/ChatGPT_Trading_Bot:mainfrom

NiSaNo70:claude/code-review-safety-01AYPJ2GeVXYpjkbtHGHDE7NNiSaNo70/ChatGPT_Trading_Bot:claude/code-review-safety-01AYPJ2GeVXYpjkbtHGHDE7NCopy head branch name to clipboard