added meta data for tutorial

input_files/Data_test_EAS.csv

+"filename"	"Consortium"	"Outcome"	"FullName"	"internalDataLink"	"Type"	"Reference"	"ReferenceLink"	"dataLink"	"Nsample"	"Ncase"	"Ncontrol"	"Nsnp"	"snpid"	"POS"	"CHR"	"a1"	"a2"	"freq"	"pval"	"n"	"z"	"OR"	"se"	"index_type"	"imp"	"ncas"	"ncont"
+"WBC_EAS_chr22.tsv"	"BCT"	"WBC"	"White blood cell count"		"Cellular"	"Chen MH et al. 2020"	"https://pubmed.ncbi.nlm.nih.gov/32888493/"	"http://ftp.ebi.ac.uk/pub/databases/gwas/summary_statistics/GCST90002001-GCST90003000/GCST90002373/harmonised/32888493-GCST90002373-EFO_0007988.h.tsv.gz"	15061			36864690	"hm_rsid"	"hm_pos"	"hm_chrom"	"hm_effect_allele"	"hm_other_allele"	"hm_effect_allele_frequency"	"p_value"		"hm_beta"		"standard_error"	"rs-number"
+"RBC_EAS_chr22.tsv"	"BCT"	"RBC"	"Red blood cell count"		"Cellular"	"Chen MH et al. 2020"	"https://pubmed.ncbi.nlm.nih.gov/32888493/"	"http://ftp.ebi.ac.uk/pub/databases/gwas/summary_statistics/GCST90002001-GCST90003000/GCST90002373/harmonised/32888493-GCST90002373-EFO_0007988.h.tsv.gz"	15061			36864690	"hm_rsid"	"hm_pos"	"hm_chrom"	"hm_effect_allele"	"hm_other_allele"	"hm_effect_allele_frequency"	"p_value"		"hm_beta"		"standard_error"	"rs-number"
+"PLT_EAS_chr22.tsv"	"BCT"	"PLT"	"Platelet cell count"		"Cellular"	"Chen MH et al. 2020"	"https://pubmed.ncbi.nlm.nih.gov/32888493/"	"http://ftp.ebi.ac.uk/pub/databases/gwas/summary_statistics/GCST90002001-GCST90003000/GCST90002373/harmonised/32888493-GCST90002373-EFO_0007988.h.tsv.gz"	15061			36864690	"hm_rsid"	"hm_pos"	"hm_chrom"	"hm_effect_allele"	"hm_other_allele"	"hm_effect_allele_frequency"	"p_value"		"hm_beta"		"standard_error"	"rs-number"