Clarify optional parameters in the POST section.

API:Movie.md

@@ -152,8 +152,13 @@ Required:
 - `path (string)` - full path to the movie on disk **or** `rootFolderPath (string)` - full path will be created by combining the rootFolderPath with the movie title
 
 Optional:
-`monitored (bool)`
-`addOptions (object)`
+- `monitored (bool)` - whether the movie should be monitored or not.
+- `addOptions (object)` - should contain a `searchForMovie (string)` key with a `bool` value whether Radarr should search for the movie upon being added. For example:
+```JSON
+"addOptions" : {
+  "searchForMovie" : true
+}
+```
 
 ##### Returns JsonObject ######