[README] Print how to start bitmask-vpn after building it

I think it's good to know how to start the client after building it

changed milestone to %2025.02 LEAP VPN Release

assigned to @peanut2

requested review from @jkito

added 17 commits

• e9fb6ec2...8e9a765d - 16 commits from branch main
• 4bfc99e8 - [README] Print how to start bitmask-vpn after building it

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approved this merge request

merged