Add XKCD cartoon to readme

as proposed in #32 (this is the last time I'll bring this up, I promise)
idank · Aug 9, 2017 · 045ace3 · 045ace3
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 explainshell is a tool (with a web interface) capable of parsing man pages, extracting options and
 explain a given command-line by matching each argument to the relevant help text in the man page.
 
+![xkcd comic 1168, which is about impossibility of remembering tar syntax](http://imgs.xkcd.com/comics/tar.png)
+
+_[https://xkcd.com/1168/](https://xkcd.com/1168/)_
+
 ## How?
 
 explainshell is built from the following components: