updated README.md

Author: Jani Giannoudis

README.md

@@ -1,10 +1,16 @@
 <h1>Payroll Engine Client Services</h1>
 
 Main library for Payroll Engine clients, including all required dependencies:
-- Function controllers (local scripting development)
+- Function controllers (local script development)
 - Function invokers
 - JSON schemas
 
+## HTML documentantion
+The client scripting library contains static HTML documentation for client developers. This is created using [docx](https://github.com/dotnet/docfx) [MIT]. The following commands are available in the `docfx` folder:
+- `Static.Build` - builds the static HTML content (output is the `_site` subdirectory)
+- `Static.Static` - opens the static help (`_site\index.html`)
+- `Server.Start` - start the static help on http://localhost:4037/ (dark mode support)
+
 ## Build
 Supported runtime environment variables:
-- *PayrollEnginePackageDir* - the NuGet package target direcotry (optional)
+- *PayrollEnginePackageDir* - the NuGet package destination directory (optional)