[readme] add link to file-set files doc

README.md

@@ -229,6 +229,7 @@ This overview provides some *quick links* to the most important sections of the
 * [Rationale](https://stnolting.github.io/neorv32/#_rationale) - why? how come? what for?
 * [Key Features](https://stnolting.github.io/neorv32/#_project_key_features) - what makes it special
 * [Structure](https://stnolting.github.io/neorv32/#_project_folder_structure) - folders, RTL files and compile order
+* [File-List Files](https://stnolting.github.io/neorv32/#_file_list_files) - to simplify HDL setup
 * [Metrics](https://stnolting.github.io/neorv32/#_fpga_implementation_results) - FPGA implementation and performance evaluation
 
 ### :desktop_computer: [NEORV32 Processor](https://stnolting.github.io/neorv32/#_neorv32_processor_soc) - The SoC