Consider adding support for `.env` file

[smuu]

[mohitvdx]

Hey @smuu Could you elaborate a bit more? I can work on this.

[anands8196]

Please explain or elaborate? @smuu

[smuu]

Thanks, @mohitvdx and @anands8196 that you want to contribute.

Currently, there is two environment variables to change the behavior of the test run: KNUU_TIMEOUT and KNUU_NAMESPACE. There will most likely be more environmental variables. To use those variables, you export them to your system or add them to the test command, which is unhandy when setting multiple variables. Therefore, the idea is to have a file called .env where the user can set the environment variables. To support that file, knuu must read that file.

I need to find out the implementation details, I would need to research them.

[smuu]

done