docs: add more api documentation

docs/docs/api.md

@@ -14,6 +14,22 @@ export interface IAPI {
 
 The above functions are all accessible through `app.plugins.plugins.podnotes.api`.
 
+## `podcast`
+This returns the currently playing episode.
+
+```js
+export interface Episode {
+    title: string,
+	streamUrl: string
+	url: string,
+	description: string,
+	podcastName: string,
+	feedUrl?: string,
+	artworkUrl?: string;
+	episodeDate?: Date;
+}
+```
+
 ## `getPodcastTimeFormatted(format: string, linkify?: boolean)`
 This function will return the current playback time formatted according to the given (moment) format.
 If `linkify` is true, the time will be linked to the current episode at the given time. This is used by PodNotes to play from the recorded time.