Add permissions page and documentation (#1098)

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+# Yomichan Permissions
+
+* `<all_urls>` <br>
+  Yomichan requires access to all URLs in order to run scripts to scan text and show the definitions popup,
+  request audio for playback and download, and connect with Anki.
+
+* `storage` and `unlimitedStorage` <br>
+  Yomichan uses storage permissions in order to save extension settings and dictionary data.
+  `unlimitedStorage` is used to help prevent web browsers from unexpectedly
+  deleting dictionary data.
+
+* `webRequest` and `webRequestBlocking` <br>
+  Yomichan uses these permissions to ensure certain requests have valid and secure headers.
+  This sometimes involves removing or changing the `Origin` request header,
+  as this can be used to fingerprint browser configuration.
+
+* `nativeMessaging` <br>
+  Yomichan has the ability to communicate with an optional native messaging component in order to support
+  parsing large blocks of Japanese text using
+  [MeCab](https://en.wikipedia.org/wiki/MeCab).
+  The installation of this component is optional and is not included by default.
+
+* `clipboardWrite` <br>
+  Yomichan supports simulating the `Ctrl+C` (copy to clipboard) keyboard shortcut
+  when a definitions popup is open and focused.
+
+* `clipboardRead` (optional) <br>
+  Yomichan supports automatically opening a search window when Japanese text is copied to the clipboard
+  while the browser is running, depending on how certain settings are configured.
+  This allows Yomichan to support scanning text from external applications, provided there is a way
+  to copy text from those applications to the clipboard.