Added basic documentation (#1)

Only available in English, too lazy to translate it in my native language.

README.md

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+# Android/IOS keyboard for Game Maker Studio (1.4/2 ?)
+# Introduction
+
+<details>
+
+<summary></summary>
+
+I created this keyboard because there was no good *free* keyboard on the marketplace.
+
+Furthermore, paid extensions were for the **native keyboard**, which means we need a different keyboard for **both** IOS and Android, alongside the lack of customization they have.
+
+So I spent 20 initial hours creating this keyboard, and less than 4 a few days after to fix few bugs and optimize the project.
+
+</details>
+
+
+
+# Features
+
+<details>
+
+<summary></summary>
+
+* Fast and easy to setup !
+* Highly customizable through simple and straightforward ~~functions~~ scripts !
+* Minimal performance impact on your game !
+* Supports up 5 keys at the same time !
+* Compatible both Android and IOS !
+
+</details>
+
+
+
+# Setup
+
+<details>
+
+<summary></summary>
+
+### Create the keyboard
+    keyboard_create(Left_position, Top_position, Width, Height);
+
+[Then customize it with to get the design you want.](#visual-customization)
+
+### Get keyboard text
+    keyboard_get_text();
+**returns:** String
+
+### Clear keyboard text
+    keyboard_clear_text();
+
+### Destroy the keyboard
+    keyboard_destroy();
+
+<br>
+
+------------
+
+<br>
+
+</details>
+
+# Obtaining key presses
+
+<details>
+
+<summary></summary>
+
+### Obtaining last pressed key
+    keyboard_get_lastkey();
+**returns:** String
+
+### Obtaining pressed key
+    keyboard_get_pressed_key();
+**returns:** String
+
+### Obtaining released key
+    keyboard_get_released_key();
+**returns:** String
+
+
+
+<br>
+
+------------
+
+<br>
+
+</details>
+
+# Keyboard coordinates
+
+<details>
+
+<summary></summary>
+
+The x and y coordinates represents the top left of the keyboard.
+However, **DON'T** move the keyboard by accessing directly thoses values !
+
+The keyboard is defined by its 4 borders (Left, Top, Right, Bottom).
+You can set and/or get the coordinate of any of the keyboard borders.
+
+## Moving the keyboard around
+
+<details>
+
+<summary></summary>
+
+### Move the keyboard from its top border
+    keyboard_set_from_top(Y_coordinate);
+
+### Move the keyboard from its bottom border
+    keyboard_set_from_bottom(Y_coordinate);
+
+### Move the keyboard from its left border
+    keyboard_set_from_left(X_coordinate);
+
+### Move the keyboard from its right border
+    keyboard_set_from_right(X_coordinate);
+
+</details>
+
+## Getting keyboard coordinates
+
+<details>
+
+<summary></summary>
+
+### Get the top border
+    keyboard_get_bbox_top();
+**returns:** real number
+
+### Get the bottom border
+    keyboard_get_bbox_bottom();
+**returns:** real number
+
+### Get the left border
+    keyboard_get_bbox_left();
+**returns:** real number
+
+### Get the right border
+    keyboard_get_bbox_right();
+**returns:** real number
+
+</details>
+
+<br>
+
+------------
+
+<br>
+
+</details>
+
+
+# Visual customization
+
+<details>
+
+<summary></summary>
+
+The keyboard have many visual properties that can be customized.
+*I don't want to describe them all but here I am*
+
+<br>
+
+## Keyboard Size
+
+<details>
+
+<summary></summary>
+
+### Resize the keyboard
+    keyboard_resize(Width, Height);
+
+### Get keyboard size
+    keyboard_get_width();
+**returns:** real number
+
+    keyboard_get_height();
+**returns:** real number
+
+<br>
+
+</details>
+
+## Keyboard background
+
+<details>
+
+<summary></summary>
+
+### Background state
+    keyboard_set_background_visible(Boolean);
+
+&ensp;
+
+    keyboard_get_background_visible();
+**returns:** boolean
+
+### Background color
+    keyboard_set_background_color(Color);
+
+    keyboard_get_background_color();
+**returns:** color
+
+</details>
+
+## Keyboard font
+
+<details>
+
+<summary></summary>
+
+### Font used
+
+<details>
+
+<summary></summary>
+
+    keyboard_set_font(Font);
+
+&ensp;
+
+    keyboard_get_font();
+**returns:** Font index
+
+</details>
+
+### Font color
+
+<details>
+
+<summary></summary>
+
+     keyboard_set_text_color(Color);
+     
+ &ensp;
+
+    keyboard_get_text_color();
+**returns:** color
+
+</details>
+
+</details>
+
+## Keyboard keycaps
+
+<details>
+
+<summary></summary>
+
+### State
+
+<details>
+
+<summary></summary>
+
+    keyboard_set_keycaps_visible(boolean);
+
+</details>
+
+### Corners
+
+<details>
+
+<summary></summary>
+
+    keyboard_set_keycaps_radius(real_number);
+
+If desired, you can set the radius on each axis individually.
+
+    keyboard_set_keycaps_x_radius(Radius);
+	keyboard_set_keycaps_y_radius(Radius);
+
+</details>
+
+### Offsets
+
+<details>
+
+<summary></summary>
+
+    keyboard_set_keycaps_offset(Offset);
+
+If desired, you can set the offset on each axis individually.
+
+    keyboard_set_keycaps_x_offset(Offset);
+	keyboard_set_keycaps_y_offset(Offset);
+
+</details>
+
+### Colors
+
+<details>
+
+<summary></summary>
+
+#### Idle state
+
+<details>
+
+<summary></summary>
+
+    keyboard_set_keycaps_color(Color);
+
+&ensp;
+
+    keyboard_get_keycaps_color();
+**returns:** color
+
+</details>
+
+#### Pressed state
+
+<details>
+
+<summary></summary>
+
+    keyboard_set_keycaps_pressed_color(Color);
+&ensp;
+
+    keyboard_get_keycaps_pressed_color();
+**returns:** color
+
+</details>
+
+</details>
+
+</details>
+
+<br>
+
+------------
+
+<br>
+
+</details>
+
+# Things to improve on the keyboard
+
+<details>
+
+<summary></summary>
+
+* Check if it works with GM 2 I guess, or port it for GM 2 if it doesn't
+* Performance, always better performance !
+Without kidding, drawing with round_rect on the surface is extremely inefficient.
+* Better handling of spriteless special keys like _ENTER_, _DELETE_...
+* Add a resizing system for keys with a sprite.
+* Make the keyboard works as a normal keyboard to allow seemless integration from a PC typing game !
+* And surely other things that I can't think of right now.
+
+</details>
+
+
+
+