adding assembly_snptyper version 0.1.1

[erinyoung]

Hi! I've found this tool useful for identification of SNPs, especially those of the M1UK emm type (it's a GAS thing).

This script isn't on bioconda, so there's no biocontainer.

The final uncompressed size is expected to be 371MB, which is mostly the reference fasta file.

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[erinyoung]

Closes #939