How to create a SNP VCF file?

I'm working through an example on the [vargeno github][1] page, and in their example they have a file called snp.vcf

github.com/medvedevgroup/vargeno/blob/master/test/snp.vcf

How would such a file be created? Would it be something you would have to write manually, or does a program generate it?

[1]: github.com/medvedevgroup/vargeno/tree/master/test



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