added web doc code

HelpPage/doc/docs/apis/Gamepads.md

@@ -12,4 +12,32 @@ There are two:
 ## Usage
 
 To use the gamepads, use the method named `get` + the name of the button or stick.
-Axes return `double` and buttons return `boolean`.
+Axes return `double` and buttons return `boolean`.
+
+## Button Registry
+
+First you must enable the feature, so add this to the `construct()` function of the `OperationMode`:
+```java
+Devices.enableButtonRegistration();
+```
+
+To register a button, use the method `registerButton` in the `Devices` class.
+
+```java
+Devices.controller#.registerButton(GamepadRequestInput.Button , "Button Usage")
+```
+
+If a button isn't registered, or you attempt to register a button twice the opmode will fail.
+To search for a button use the method `searchForButton` in the `Devices` class.
+
+```java
+Devices.controller#.buttonSearch("Button Usage")
+```
+
+See the Buttoner.java Opmode to see sample code
+
+If you want a list of buttons and their uses, possibly to print to the driver station, use the method `getButtonRegistry` in the `Devices` class.
+
+```java
+Devices.genList();
+```