Update README_DI.md

examples/test_experiments/README_DI.md

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 ## How to use?
-1.step1: run kaggle_to_analysis.py 
+1.step1: run kaggle_to_analysis.py
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 2.step2: run first_analysis_to_code.py
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 3.step3: run code_to_analysis.py
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 4.step4: run random_sample_analysis_with_baseline.py
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 5.step5: run insights_to_code.py
 
 ## The Result
 1.After the first step, you will obtain manual experience extracted from Kaggle.
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 2.After the second step, you will utilize the experience from Kaggle to allow DI to generate the first round of 10 samples.
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 3.After the third step, you will obtain the experience from the first round of samples.
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 4.After the fourth step, you will obtain insights combined with the baseline code.
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 5.After the fifth step, you will obtain new code samples generated based on insights from different task types, which will be the samples for the second round.
 
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