Looking at your questions, it seems as if you didn’t read the first post and the provided docs correctly. But anyways, here are your answers:
These files are automatically created when you run rush create <extension_name>.
Using the build command, like this: rush build. More on that here.
Make sure you have downloaded rush.zip from the release section. I see many users downloading the source code even though its clearly mentioned what to download in the installation wiki.
i am pretty sure i downloaded the correct zip but still command not working
see this -
i am using GitBash
Have you added the Rush/bin directory to the PATH? If yes, can you show me that directory in file explorer?
wait i just saw my variables again and i think i mistakely deleted one character from it sorry i just run it again and it worked i will reply when i have some doubts
when i tried to build extension it showed this -
It should work in Git Bash. 
Can you try restarting the terminal. If that doesn’t work, try using PowerShell.
ok i will try
I got this error: Metadata file (rush.yml) not found
└ Failed
seems like you deleted the rush.yml file
it’s still here
GitBash is still not working i will try to do with PowerShell
You need to cd into test, i.e., the name of your extension.
Which version of Windows do you have?
Windows 10
even me Windows 10
I was asking that to @luv.ak.tech. Anyways, does it work for you know?
EDIT: @luv.ak.tech’s issue is fixed. He was creating the extension in the same directory where he unzipped rush.zip, which is not allowed.
You need to cd into the generated extension’s directory and not the directory named “extension”, which in your case is “demo”. Its clearly mentioned there in the terminal.
