chore(docs): finish most of v2's documentation

docs/API/interaction-manager.md

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+# InteractionManager
+
+Handles direct interactions.
+
+## API
+
+* InteractionManager 
+  * [.like(video_id)](#like) 
+  * [.dislike(video_id)](#dislike) 
+  * [.removeLike(video_id)](#removelike) 
+  * [.subscribe(video_id)](#subscribe) 
+  * [.unsubscribe(video_id)](#unsubscribe) 
+  * [.comment(video_id, text)](#comment) 
+  * [.translate(text, target_language, args?)](#translate) 
+  * [.setNotificationPreferences(channel_id, type)](#setnotificationpreferences) 
+
+<a name="like"></a>
+### like(video_id)
+
+Likes given video.
+
+**Returns:** `Promise.<ActionsResponse>`
+
+| Param | Type | Description |
+| --- | --- | --- |
+| video_id | `string` | Video id |
+
+<a name="dislike"></a>
+### dislike(video_id)
+
+Dislikes given video.
+
+**Returns:** `Promise.<ActionsResponse>`
+
+| Param | Type | Description |
+| --- | --- | --- |
+| video_id | `string` | Video id |
+
+<a name="removelike"></a>
+### removeLike(video_id)
+
+Remover like/dislike.
+
+**Returns:** `Promise.<ActionsResponse>`
+
+| Param | Type | Description |
+| --- | --- | --- |
+| video_id | `string` | Video id |
+
+<a name="subscribe"></a>
+### subscribe(channel_id)
+
+Subscribes to given channel.
+
+**Returns:** `Promise.<ActionsResponse>`
+
+| Param | Type | Description |
+| --- | --- | --- |
+| channel_id | `string` | Channel id |
+
+<a name="unsubscribe"></a>
+### unsubscribe(channel_id)
+
+Unsubscribes from given channel.
+
+**Returns:** `Promise.<ActionsResponse>`
+
+| Param | Type | Description |
+| --- | --- | --- |
+| channel_id | `string` | Channel id |
+
+<a name="comment"></a>
+### comment(video_id, text)
+
+Posts a comment on given video.
+
+**Returns:** `Promise.<ActionsResponse>`
+
+| Param | Type | Description |
+| --- | --- | --- |
+| video_id | `string` | Video id |
+| text | `string` | Comment content |
+
+<a name="translate"></a>
+### translate(text, target_language, args?)
+
+Translates given text using YouTube's comment translation feature.
+
+**Returns:** `Promise.<ActionsResponse>`
+
+| Param | Type | Description |
+| --- | --- | --- |
+| text | `string` | Text to be translated |
+| target_language | `string` | ISO language code |
+| args? | `object` | Additional arguments |
+
+<a name="setnotificationpreferences"></a>
+### setNotificationPreferences(channel_id, type)
+
+Changes notification preferences for a given channel.
+Only works with channels you are subscribed to.
+
+**Returns:** `Promise.<ActionsResponse>`
+
+| Param | Type | Description |
+| --- | --- | --- |
+| channel_id | `string` | Channel id |
+| type | `string` | `PERSONALIZED`, `ALL` or `NONE` |