COMPMID-1065 : Create documentation explaining how to add new functions / kernels

Change-Id: I98183f95814442b6f3dbb67a1bdae99df05b9b01
diff --git a/arm_compute/core/Types.h b/arm_compute/core/Types.h
index ef25dc4..0f2786c 100644
--- a/arm_compute/core/Types.h
+++ b/arm_compute/core/Types.h
@@ -105,6 +105,8 @@
 /** Constant value used to indicate a ORB scaled pyramid */
 constexpr float SCALE_PYRAMID_ORB = 8.408964152537146130583778358414e-01;
 
+/** [DataLayout enum definition] **/
+
 /** Supported tensor data layouts */
 enum class DataLayout
 {
@@ -112,6 +114,7 @@
     NCHW,    /**< Num samples, channels, height, width */
     NHWC     /**< Num samples, height, width, channels */
 };
+/** [DataLayout enum definition] **/
 
 /** Supported tensor data layout dimensions */
 enum class DataLayoutDimension