Add well-known mnemonics

[mkotowski]

Is your feature request related to a problem? Please describe.
Since one of the goals stated in the README.md is exploring sequences user may be not familiar with, I think it may be useful to include mnemonics along the description of what a given sequence does. It can make it far easier to search for a further documentation, especially in the cases where the sequence has a form with many optional parameters, making unclear what exactly string to search for.

Describe the solution you'd like
I imagine something along an optional flag, which causes the description to be prefixed with the mnemonic.

Example implementation of the idea: #57

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Mnemonics I am aware of are those introduced by: ECMA-48, DEC, and several introduced by xterm.

[meowgorithm]

Hey @mkotowski. This is an interesting idea (saw your implementation in #57 as well). I'm going to convert this into a discussion to talk through it. If we decide to go ahead with it, we'll convert it back to an issue.