Retire cnv-comparison (#215)

* Add README noting analysis is deprecated

* one sentence per line

analyses/cnv-comparison/README.md

@@ -0,0 +1,10 @@
+## Compare CNV callers
+
+This analysis is **DEPRECATED**. 
+It was designed to compare results from CNVkit and ControlFreeC when both methods produced SEG files and when the following [was noted in the README](https://github.com/AlexsLemonade/OpenPBTA-analysis/tree/0c2d0d25c01dcbbbd63f94b064a69afc9dc44ea8#data-caveats):
+
+> We noticed ControlFreeC does not properly handle aneuploidy well for a subset of samples in that it calls the entire genome gained. 
+
+As of `release-v7-20191031`, the CNV files are in two different formats (see: [CNVkit format](https://cnvkit.readthedocs.io/en/stable/fileformats.html) and [ControlFreeC format](https://github.com/AlexsLemonade/OpenPBTA-analysis/blob/master/doc/format/controlfreec-tsv.md)).
+
+Consensus copy number calls are tracked here: https://github.com/AlexsLemonade/OpenPBTA-analysis/issues/128