Doc/tutorials

This branch expands the tutorial created by @kschulz.

The Basic tutorial flow is the following:

1. Create a empty project using the helper scripts of FWK (./fwk/scr/init_fwfwk_prj.sh and ./fwk/scr/init_demo_module.sh)
2. Modify project.tcl to add the app_demo module
3. Create the project and view the result

The second tutorial focuses on showing the usage of the DesyRDL together with FWK using the example_desyrdl module. 1.clone the example_desyrdl module 2. Inspect the example_desyrdl.rdl file and talk about its important things about FWK related lines. 3. Edit the project.tcl to add the example_desyrdl module address space 4. Generate the project and view the results.