website: Added tutorial for gem5 stdlib

The tutorial provides details on creating your own board,
using stdlib components like caches, cores, processors,
and memory. It also provides details on merging them into
one board that can be imported.

Change-Id: I743eee41963cd1fbd6b9e561aa343b174a205a99
Co-authored-by: Jasjeet Rangi <jasrangi@ucdavis.edu>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5-website/+/63554
Maintainer: Bobby Bruce <bbruce@ucdavis.edu>
Tested-by: Bobby Bruce <bbruce@ucdavis.edu>
Reviewed-by: Kunal Pai <kunpai@ucdavis.edu>
Reviewed-by: Bobby Bruce <bbruce@ucdavis.edu>
2 files changed