Edit: Is it possible for me to download and install the plugin myself to try on Electrum while they don't include officially? I tried to put the chipmixer folder in my Electrum\plugins folder and the option doesn't show up on Tools -> Plugins.
Current version of Electrum does not allow plugins to add their actions in Tools menu (or any other menu). After
this pull request gets merged to released version, this plugin will require copying chipmixer folder into Electrum\plugins folder and enabling it in Tools -> Plugins.
If
this pull request gets merged, only enabling the plugin will be required for it to work.
Till then, plugin works only with development version of Electrum:
https://github.com/chipmixer/electrum (branch: plugin). My advise: wait for official one. I cannot tell you "it's easier!" then ask you to compile it yourself, can I?