added docs for installing p4sim

[Vineet1101]

This PR add documents and some example on using P4Sim( a P4 based ns-3 module used to run P4 switches inside ns-3 environment)

[Vineet1101]

@fruffy @jafingerhut can you tell where should I add the docs and examples of using p4sim

[fruffy]

@fruffy @jafingerhut can you tell where should I add the docs and examples of using p4sim

We have a doc folder. I would consider placing it there, then hinting on the top-level readme.

[fruffy]

Need to sign the DCO

[fruffy]

I know LLMs generally use emojis a lot but I would consider dropping them. They're often just clutter.

[Vineet1101]

I have copy pasted the documentation from the original P4Sim docs will remove the emojis

[Vineet1101]

hey @fruffy @jafingerhut can you please review it

[fruffy]

hey @fruffy @jafingerhut can you please review it

It looks good from my side. @jafingerhut usually merges/manages PRs for this repo

[Vineet1101]

hey @jafingerhut can you please review this

[Dscano]

@fruffy, could you please add me and @Mingyumaz as reviewers?

[fruffy]

@fruffy, could you please add me and @Mingyumaz as reviewers?

Reviewing usually requires repository write permissions, but I added you as P4 members, which was overdue anyway.

[Vineet1101]

hey @Dscano can you review this please and if everything is good can you merge it

[jafingerhut]

I have tried only the part of the install instructions at the beginnins for ns3.39, and they seemed to work without error.

Note: It is confusing to beginners that the first example command to run gives an error:

$ ./ns3 run "exampleA"
Traceback (most recent call last):
  File "/home/p4/workdir/ns3.39/./ns3", line 1615, in <module>
    main()
  File "/home/p4/workdir/ns3.39/./ns3", line 1575, in main
    raise Exception("Couldn't find the specified program: %s" % target_to_run)
Exception: Couldn't find the specified program: exampleA

It would be nice if there were some working instructions for steps to try to run a first simple P4 program in the p4sim environment.

[Vineet1101]

so I can add those instructions to run a program in a PR??

[jafingerhut]

so I can add those instructions to run a program in a PR??

If you would like to, please do so.