No guidance on how to do it with IIH Essentials integrated into IIH, also change references to Data Service

[miczlo]

Performance-Analytics/docs/Installation.md

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	### Configure an asset with variables
	Click on the icon "Assets & Connectivity" on the left bar. Add a child asset for the main "edge" asset. Into this child asset add 5 subassets for the stations.
	
	Create an aspect for every step. The first step of each branch (step 2 and step 11) must be configured as initial step. This is necessary to mark the beginning of the sequence and to link the corresponding product for the branch.
	First step of the branch:
	
	Following steps of the branch:
	
	Link the variables that have been created by adding the aspects to the corresponding Connector tags.
	
	Repeat this process for every station.