Update README.md

Added order of script execution

0.2/README.md

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 ## UKB GWAS pipeline scripts written for Hail 0.2
 
 These scripts were used to run the GWAS pipeline in Hail 0.2 for the [UK Biobank biomarker measurements](http://www.nealelab.is/blog/2019/9/16/biomarkers-gwas-results)
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+Here is the order of script execution:
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+1. irnt.biomarkers.py
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+2. create_phenotype_summary.biomarkers.py
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+3. build_pipelines.biomarkers.py
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+4. create_ldsc_hm3_table.py
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+5. load_mfi_ht.py
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+6. run_regressions.biomarkers.py
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+7. load_results_matrix_table.biomarkers.py
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+8. export_results.biomarkers.py
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+9. export_ldsc_sumstats_biomarkers.py