Enhance Configuration, Documentation, and Script Functionality

[Kappuccino111]

• Add a single file for configuring all requirements.
• Update documentation.rst to be more comprehensive.
• Resolve issue in zephyr_build_run_sim.sh
• Add a contributing guide

[jonas-rem]

The issues in zephyr_build_run_sim.sh could be related to setting up the zeth network interface via net-setup. If the setup worked you should see the zeth if with ip a

17: zeth: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc fq_codel state DOWN group default qlen 1000
    link/ether 00:00:5e:00:53:ff brd ff:ff:ff:ff:ff:ff
    inet 192.0.2.2/24 scope global zeth
       valid_lft forever preferred_lft forever
    inet6 2001:db8::2/128 scope global nodad 
       valid_lft forever preferred_lft forever
    inet6 fe80::200:5eff:fe00:53ff/64 scope link proto kernel_ll 
       valid_lft forever preferred_lft forever

[Kappuccino111]

Closed #22 and #21. Will create a single PR with all the changes, which when merged will automatically accomplish what the individual PRs were doing 👍