Add readme

Author: Christopher Mühl

README.md

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+# `vuepress-plugin-code-switcher`
+
+### Installation
+Install `vuepress-plugin-code-switcher` as a dependency and add it to your config's plugin list:
+
+```js
+module.exports = {
+    plugins: [ 'code-switcher' ]
+}
+```
+
+### Example
+```markdown
+<CodeSwitcher :languages="{js:'JavaScript',ts:'TypeScript'}">
+<template v-slot:js>
+
+    ```js
+    module.exports = function (str) {
+        return typeof str === 'string' && str.trim() === str
+    }
+    ```
+
+</template>
+<template v-slot:ts>
+
+    ```ts
+    export default function isString (str: string) : str is string {
+        return typeof str === 'string' && str.trim() === str
+    }
+    ```
+
+</template>
+</CodeSwitcher>
+```
+
+The extra newline between the `<template>` tags and their content is necessary if you want to have Markdown interpreted within the component.