Add/edit README files for infra/recipes

Bug: skia:6473
Change-Id: I050df47a5a3f633263f0ca6258e83e96b78d7957
Reviewed-on: https://skia-review.googlesource.com/13123
Commit-Queue: Eric Boren <borenet@google.com>
Reviewed-by: Stephan Altmueller <stephana@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
Reviewed-by: Ben Wagner <benjaminwagner@google.com>

1 files changed, 21 insertions, 0 deletions

diff --git a/infra/bots/recipes/README.md b/infra/bots/recipes/README.md
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+Skia Recipes
+============
+
+These are the top-level scripts which run inside of Swarming tasks to perform
+all of Skia's automated testing.
+
+To run a recipe locally:
+
+	$ python infra/bots/recipes.py run --workdir=/tmp/<workdir> <recipe name without .py> key1=value1 key2=value2 ...
+
+Each recipe may have its own required properties which must be entered as
+key/value pairs in the command.
+
+When you change a recipe, you generally need to re-train the simulation test:
+
+	$ python infra/bots/recipes.py simulation_test train
+
+The simulation_test generates expectations files for the tests contained within
+each recipe which illustrate which steps would run, given a particular set of
+inputs. Pay attention to the diffs in these files when making changes to ensure
+that your change has the intended effect.