Add docs regarding vscode debugger, c# client, FAQ, Architecture and forms

[valentimarco]

Related to issue #43 #145 #143 #21 #148.

For the page forms i want some feedback:

• I want to put for each phase a minimal example (like i already done with the method message)
• The explanation of the form is enough to understand: how forms works and which method you need to overload base on what you need?
• Is the example of typical scenario clear?
• are there something i miss or i don't understand of the forms?

[valentimarco]

@sambarza squash the commits and add @kodaline as co-author!