filter homopolymer instructions in docs

Author: hdashnow

docs/source/filter.rst

@@ -0,0 +1,17 @@
+Filter
+=====
+
+.. toctree::
+   :maxdepth: 2
+   :caption: Contents:
+
+
+Filtering output
+----------------
+
+In our experience, homopolymers, and some repetitive regions are enriched for false positives. You may find the following filters useful:
+
+Exclude homopolymers
+Require the repeatunit column be greater than 1 character.
+STRs.tsv files: `awk '(length($6) > 1)'`
+*-genotype.txt files: `awk '(length($4 > 1)'`

docs/source/index.rst

@@ -19,6 +19,7 @@ Dashnow, H., Pedersen, B.S., Hiatt, L. et al. STRling: a k-mer counting approach
    install
    run
    outputs
+   filter
    workflows
    test
    debug