Add shell completions and manpage
* Add manpage Adds a basic manpage that was autogenerated with `help2man` and then slightly adjusted with information from the README.md and better formatting. * Add zsh completions Add completions for the zsh shell. These should be complete and even allow completion of the command inside `--command` and `-e`. * Add bash completions The bash completions are almost on the same level as the zsh completions. The only little thing the bash completions do not do is complete inside of `--command` and `-e`, instead bash just stops completion after these options. * Update readme with manpage and completions Added the install instructions for the manpage and completions to the README.md. Also tweaked the current readme a slight bit because the build section was structured in a slightly confusing way.
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