Document basic partial correlations dependencies

* Document the things that the partial correlations feature depends on to work

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 ```
 
 It is very important that the column header names for the strains correspond to the genotype file used.
+
+## Partial Correlations
+
+The partial correlations feature depends on the following external systems to run correctly:
+
+- Redis: Acts as a communications broker between the webserver and external processes
+- `sheepdog/worker.py`: Actually runs the external processes that do the computations
+
+These two systems should be running in the background for the partial correlations feature to work correctly.