Added a per-plugin README files

Author: naithar

plugins/arkit/README.md

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+# Godot iOS ARKit plugin
+
+Uses Godot's `XRInterface`/`ARVRInterface` to handle iOS AR functionality.  
+
+## Methods
+
+`set_light_estimation_is_enabled(bool flag)` - Sets a value responsible for usage of estimation of lighting conditions based on the camera image.  
+`get_light_estimation_is_enabled()` - Returns a value responsible for usage of estimation of lighting conditions based on the camera image.  
+`get_ambient_intensity()` - Returns a value used for intensity, in lumens, of ambient light throughout the scene.  
+`get_ambient_color_temperature()` - Return a value used for color temperature of ambient light throughout the scene.  
+`raycast(Vector2 screen_coords)` - Performs a raycast to search for real-world objects or AR anchors in the captured camera image.  
+
+## Properties
+
+`light_estimation: bool` - Returns or sets a value responsible for usage of estimation of lighting conditions based on the camera image.  
+
+## Events reporting

plugins/camera/README.md

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+# Godot iOS Camera plugin
+
+Uses Godot's `CameraServer` to handle iOS device camera feed.  
+
+## Methods
+
+## Properties
+
+## Events reporting

plugins/gamecenter/README.md

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+# Godot iOS GameCenter plugin
+
+## Methods
+
+### Authorization
+
+`authenticate()` - Performs user authentication.  
+`is_authenticated()` - Returns authentication state.  
+
+### GameCenter methods
+
+`post_score(Dictionary score_dictionary)` - Reports a score data to iOS `GameCenter`. Generates new event with `post_score` type.  
+`award_achievement(Dictionary achievent_dictionary)` - Reports progress of achievement data to iOS `GameCenter`. Generates new event with `award_achievement` type.  
+`reset_achievements()` - Resets all achievement progress for the local player. Generates new event with `reset_achievements` type.  
+`request_achievements()` - Loads previously submitted achievement progress for the local player from iOS `GameCenter`. Generates new event with `achievements` type.  
+`request_achievement_descriptions()` - Downloads the achievement descriptions from iOS `GameCenter`. Generates new event with `achievement_descriptions` type.  
+`show_game_center(Dictionary screen_dictionary)` - Displays Game Center information of your game. Generates new event with `show_game_center` type when information screen closes.  
+`request_identity_verification_signature()` -  Creates a signature for a third-party server to authenticate the local player. Generates new event with `identity_verification_signature` type.  
+
+## Properties
+
+## Events reporting
+
+`get_pending_event_count()` - Returns number of events pending from plugin to be processed.  
+`pop_pending_event()` - Returns first unprocessed plugin event.  

plugins/icloud/README.md

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+# Godot iOS iCloud plugin
+
+Plugin generates new event with `key_value_changed` type when values stored in the iCloud key-value store changes.  
+
+## Methods
+
+`remove_key(String key)` - Removes the value associated with the specified key from the iCloud key-value store.  
+`set_key_values(Dictionary values)` - Sets multiple objects for the specified keys in the iCloud key-value store.  
+`get_key_value(String key)` - Returns the object associated with the specified key stored in iCloud key-value store.  
+`synchronize_key_values()` - Synchronizes in-memory keys and values for iCloud storage with those stored on disk.  
+`get_all_key_values()` - Returns a dictionary containing all of the key-value pairs in the iCloud key-value store.  
+
+## Properties
+
+## Events reporting
+
+`get_pending_event_count()` - Returns number of events pending from plugin to be processed.  
+`pop_pending_event()` - Returns first unprocessed plugin event.  

plugins/inappstore/README.md

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+# Godot iOS InAppStore plugin
+
+## Methods
+
+`request_product_info(Dictionary products_dictionary)` - Loads the unique identifiers for your in-app products in order to retrieve products information. Generates new event with `product_info` type.  
+`restore_purchases()` - Asks App Store payment queue to restore previously completed purchases. Generates new event with `restore` type.  
+`purchase(Dictionary product_dictionary)` - Adds a product payment request to the App Store payment queue. Generates new event with `purchase` type.  
+`set_auto_finish_transaction(bool flag)` - Sets a value responsible for enabling automatic transaction finishing.  
+`finish_transaction(String product_id)` - Notifies the App Store that the app finished processing the transaction.  
+
+## Properties
+
+## Events reporting
+
+`get_pending_event_count()` - Returns number of events pending from plugin to be processed.  
+`pop_pending_event()` - Returns first unprocessed plugin event.