feat: add project readme

Signed-off-by: Kaan Çolak <kaancolak95@gmail.com>

Author: kaancolak

projects/AutowareCenterPoint/README.md

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+## Introduction
+
+The **[mmdetection3d](https://github.com/open-mmlab/mmdetection3d)** repository includes an additional voxel encoder 
+feature for the CenterPoint 3D object detection model, known as voxel center z,
+not originally used in the **[main implementation](https://github.com/tianweiy/CenterPoint)**,
+Autoware maintains consistency with the input size of the original implementation. Consequently,
+to ensure integration with Autoware's lidar centerpoint package, we have forked the original repository and made
+the requisite code modifications.
+
+To train custom CenterPoint models and convert them into ONNX format for deployment in Autoware, please refer to the instructions provided in the README.md file included with
+Autoware's **[lidar_centerpoint](https://autowarefoundation.github.io/autoware.universe/main/perception/lidar_centerpoint/)** package. These instructions will provide a step-by-step guide for training the CenterPoint model.