Added an example demonstrating the WSF_FORM component from wsf_html library.

examples/form/README.md

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+This example demonstrates the use of the `wsf_html` library for web form handling.
+
+To simplify the code, it is also using the `WSF_RESPONSE.send (WSF_RESPONSE_MESSAGE)`,
+thus no need to write the expected http header here.
+
+The current code is a web interface form, returning html page as response.
+		
+notes:
+* It is not using the `WSF_ROUTER` component to keep the example as simple as possible.
+* It is also possible to use the `WSF_REQUEST.form_parameter (...)` directly, 
+	  but WSF_FORM provides advanced processing.
+* For a CRUD REST API, you can also use `WSF_FORM` to analyze the incoming POST values, 
+	  however the html generation may be too verbose for a simple REST api.
+	  
+warning: depending on your system and connector, you may need to use `WSF_REQUEST.set_uploaded_file_path (...)`
+		to tell the server where to store the temporary uploaded files.
+		(this should be a directory with write permission for the server).
+		For that
+			- inherit from WSF_REQUEST_EXPORTER
+			- in `execute` add at the beginning the call `request.set_uploaded_file_path (path-to-wanted-directory)`