[docs] made structure for user docs combining manual and existing help

docs/docs.user.hr.appraisal.md

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+---
+{
+	"_label": "Appraisal"
+}
+---
+In ERPNext, you can manage Employee Appraisals by creating an Appraisal Template for each role with the parameters that define the performance and giving a weight to each parameter.
+
+Once the Appraisal Template is completed, you can create Appraisal records for each period where you track performance. You can give points out of 5 for each parameter and the system will calculate the overall performance of the Employee.
+
+To make the Appraisal final, make sure to “Submit” it.