Draft: Count gene

Issue #11 Before writing the CLI, I wanted to ask wether the method for counting the reads for each gene would work fine like I scripted it. In addition, I wanted to ask you wether you think there would be a more efficient way to do this. As of now, the function reads through the entire bam file, and it could take long for a high number of reads. Thank you!

marked this merge request as draft

requested review from @zavolan

Related to !21 (closed). Can you please have a look, @zavolan, and answer Michele's questions?

closed