Add dark theme

[blue0513]

I added dark theme personally (#3)
However, since I don't know about Vue.js first of all, some parts of them may be not coded properly.

To check them, on src/renderer/main.js, you should:

Vue.prototype.$theme = (() => {
    // const {classes} = themes.light.attach();
    const {classes} = themes.dark.attach();
    return classes;
  })();

Anyway, thank you for creating such a nice Qiita viewer!!

[nju33]

Hi @blue0513, Thank you for making the theme😆
However, I changed the theme name from dark to blue0513.

The theme can be changed as follows.

[blue0513]

@nju33 Hi! Thx for merging my PR!! (It's almost the first merged case 👍 )

Anyway, another developer sent me a great PR about dark theme (see: blue0513#1)
But considering Git work flow, I will close the PR and recommend him to re-sent you the nice PR.

[JotaroS]

Hi @nju33,
As @blue0513 said I created another theme which I dimmed a bit out of his theme.
And as I make sure all works well then I will put another PR to you.