Display info about SSH session

[shiroyasha]

Motivated by the following question on support:

"Tried to do ssh to remote host but did not find my app folder at all."

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One idea could be to display something like this when we jump into the box:

Here we could point out:

• Where are your commands stored
• Duration of this SSH session and that you need to close it
• How to checkout your code

[shiroyasha]

Resolved here https://github.com/semaphoreci/cli/pull/136.