Add test object parameter reference

[kingo55]

Hey guys,

I documented the test object parameters. I'm not 100% sure about the functionality for shared JS/CSS though.

Does this seem accurate?:

Test object: Root level

Parameter	Description
css Type: string Optional	Shared CSS for the test object that is applied to all recipes. JS format: Expects a JS string of CSS styles. YAML format: Expects a relative path to a CSS file.
divertTo Type: string Optional	Enable divert mode to send all eligible traffic into a particular recipe's key.
id Type: string Required	A canonical test object ID by which subjects' assignments are recorded against.
js Type: function Required	Shared JS for the test object that is applied to all recipes. JS format: Expects a valid JavaScript function on this key. YAML format: Expects a relative path to a JS file with that function.
name Type: string Required	The name of the test object that's useful in tracking.
recipes Type: object Required	An object containing the definition of available recipes.
sampleRate Type: number Required	The percentage of traffic to assign into the experiment between 0 and 1 (where 1 is 100%)
state Type: string Required	A test object's state. Can be either: live - in the container, accepting traffic into the experiment staging - built into the container but not accepting traffic without a preview URL inactive - not parsed or built into the container
trigger Type: function Required	A JavaScript function executed as soon as the test object is loaded and can be used to conditionally activate an experiment. JS format: Expects a valid JavaScript function on this key. YAML format: Expects a relative path to a JS file with that function.

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