Skype Master is the Skype supreme plugin for any WordPress powered website. Includes Show Online Status Button.
The paid version of this plugin looks to be quite nifty, but the free version does virtually nothing: it gives you an "add me on Skype" widget in the sidebar, but not much else (no status, no "call me", no shortcodes).
Two stars because it does something and didn't crash my site. Two stars because you could have just gone to https://dev.skype.com/skype-uri/generator and pasted the code into your sidebar instead.
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