feat(structure): add prefab and base documentation

The base XR Plugin Framework camera rig prefab has been added along
with the required base documentation.

Author: extendreality

CHANGELOG.md.meta

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+# Class CallbackContextToBoolean.UnityEvent
+
+Defines the event with the transformed System.Boolean value.
+
+##### Inheritance
+
+* System.Object
+* CallbackContextToBoolean.UnityEvent
+
+###### **Namespace**: [Tilia.Input.UnityInputSystem.Transformation.Conversion]
+
+##### Syntax
+
+```
+[Serializable]
+public class UnityEvent : CallbackContextToBoolean.UnityEvent<bool>
+```
+
+[Tilia.Input.UnityInputSystem.Transformation.Conversion]: README.md

Documentation.meta

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+# Class CallbackContextToBoolean
+
+Transforms a InputAction.CallbackContext to a System.Boolean.
+
+## Contents
+
+* [Inheritance]
+* [Namespace]
+* [Syntax]
+* [Methods]
+  * [Process(InputAction.CallbackContext)]
+
+## Details
+
+##### Inheritance
+
+* System.Object
+* [CallbackContextTransformer]<System.Boolean, [CallbackContextToBoolean.UnityEvent]\>
+* CallbackContextToBoolean
+
+##### Inherited Members
+
+[CallbackContextTransformer<Boolean, CallbackContextToBoolean.UnityEvent>.ContextToProcess]
+
+[CallbackContextTransformer<Boolean, CallbackContextToBoolean.UnityEvent>.ProcessResult(InputAction.CallbackContext)]
+
+##### Namespace
+
+* [Tilia.Input.UnityInputSystem.Transformation.Conversion]
+
+##### Syntax
+
+```
+public class CallbackContextToBoolean : CallbackContextTransformer<bool, CallbackContextToBoolean.UnityEvent>
+```
+
+### Methods
+
+#### Process(InputAction.CallbackContext)
+
+Transforms the given input InputAction.CallbackContext to the equivalent System.Boolean value.
+
+##### Declaration
+
+```
+protected override bool Process(InputAction.CallbackContext input)
+```
+
+##### Parameters
+
+| Type | Name | Description |
+| --- | --- | --- |
+| InputAction.CallbackContext | input | The value to transform. |
+
+##### Returns
+
+| Type | Description |
+| --- | --- |
+| System.Boolean | The transformed value. |
+
+[CallbackContextTransformer]: CallbackContextTransformer-2.md
+[CallbackContextToBoolean.UnityEvent]: CallbackContextToBoolean.UnityEvent.md
+[CallbackContextTransformer<Boolean, CallbackContextToBoolean.UnityEvent>.ContextToProcess]: CallbackContextTransformer-2.md#Tilia_Input_UnityInputSystem_Transformation_Conversion_CallbackContextTransformer_2_ContextToProcess
+[CallbackContextTransformer<Boolean, CallbackContextToBoolean.UnityEvent>.ProcessResult(InputAction.CallbackContext)]: CallbackContextTransformer-2.md#Tilia_Input_UnityInputSystem_Transformation_Conversion_CallbackContextTransformer_2_ProcessResult_InputAction_CallbackContext_
+[Tilia.Input.UnityInputSystem.Transformation.Conversion]: README.md
+[Inheritance]: #Inheritance
+[Namespace]: #Namespace
+[Syntax]: #Syntax
+[Methods]: #Methods
+[Process(InputAction.CallbackContext)]: #ProcessInputAction.CallbackContext

Documentation/API.meta

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+# Class CallbackContextToFloat.UnityEvent
+
+Defines the event with the transformed System.Single value.
+
+##### Inheritance
+
+* System.Object
+* CallbackContextToFloat.UnityEvent
+
+###### **Namespace**: [Tilia.Input.UnityInputSystem.Transformation.Conversion]
+
+##### Syntax
+
+```
+[Serializable]
+public class UnityEvent : CallbackContextToFloat.UnityEvent<float>
+```
+
+[Tilia.Input.UnityInputSystem.Transformation.Conversion]: README.md