snarkvm cli doc doesn't mention .env

[bendyarm]

If you do snarkvm new hello and follow the examples in the documentation here
it doesn't work because of a missing .env file.
(Note, the requirement was added here.)

If snarkvm new were to create a working .env file then the example would work,
but unless and until then, the documentation should have
a step where the .env file is created.
Note, if you are just trying out a test program and don't care about the network or private key,
you can use a dummy file like this:

NETWORK=mainnet
PRIVATE_KEY=APrivateKey1zkp4X9ApjTb7Rv8EABfZRugXBhbPzCL245GyNtYJP5GYY2k

[bendyarm]

Note for comparison, leo new foo does create a .env file so the Leo doc is OK in relation to this issue.