Add instruction for first log in

[erickguan]

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• I have read the contributing guideline and understand that I have made the correct modifications

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Description:

Add the instructions on the application setup.

Benefits of this PR and context:

Easier to find out what to do to log in.

[github-actions]

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[LinuxServer-CI]

I am a bot, here are the test results for this PR:
https://ci-tests.linuxserver.io/lspipepr/speedtest-tracker/v0.21.4-pkg-4d08a9bd-dev-13446dabda5ea0f73730df598d3be7e7fc463cd4-pr-33/index.html
https://ci-tests.linuxserver.io/lspipepr/speedtest-tracker/v0.21.4-pkg-4d08a9bd-dev-13446dabda5ea0f73730df598d3be7e7fc463cd4-pr-33/shellcheck-result.xml

Tag	Passed
amd64-v0.21.4-pkg-4d08a9bd-dev-13446dabda5ea0f73730df598d3be7e7fc463cd4-pr-33	✅
arm64v8-v0.21.4-pkg-4d08a9bd-dev-13446dabda5ea0f73730df598d3be7e7fc463cd4-pr-33	✅

[LinuxServer-CI]

I am a bot, here are the test results for this PR:
https://ci-tests.linuxserver.io/lspipepr/speedtest-tracker/v0.22.0-pkg-9ee9da2b-dev-b389da4364fd8e41080ea529339526b2c883d595-pr-33/index.html
https://ci-tests.linuxserver.io/lspipepr/speedtest-tracker/v0.22.0-pkg-9ee9da2b-dev-b389da4364fd8e41080ea529339526b2c883d595-pr-33/shellcheck-result.xml

Tag	Passed
amd64-v0.22.0-pkg-9ee9da2b-dev-b389da4364fd8e41080ea529339526b2c883d595-pr-33	✅
arm64v8-v0.22.0-pkg-9ee9da2b-dev-b389da4364fd8e41080ea529339526b2c883d595-pr-33	✅

[LinuxServer-CI]

This pull request has been automatically marked as stale because it has not had recent activity. This might be due to missing feedback from OP. It will be closed if no further activity occurs. Thank you for your contributions.

[LinuxServer-CI]

This pull request is locked due to inactivity