Is your issue creating files or are you not sure whether Elixir is installed in the first place?
For the latter, open the terminal in VScode and type ‘elixir -v’ and you should get something like the following
PS C:> elixir -v
Erlang/OTP 24 [erts-12.3.2.2] [source] [64-bit] [smp:12:12] [ds:12:12:10] [async-threads:1] [jit]
Elixir 1.13.4 (compiled with Erlang/OTP 22)
You can always just go into your folder using the explorer and make a new file and just call it elixir1.exs btw
