Update README.md

Author: M-ichae-l

README.md

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 # ameba-arduino-doc
 
-## [Ameba Arduino SDK Documents](https://ameba-doc-arduino-sdk.readthedocs-hosted.com/en/latest/)
+Ameba Arduino SDK Documents: [https://ameba-doc-arduino-sdk.readthedocs-hosted.com/en/latest/](https://ameba-doc-arduino-sdk.readthedocs-hosted.com/en/latest/)
+RTD project: [https://app.readthedocs.com/projects/ameba-doc-arduino-sdk/](https://app.readthedocs.com/projects/ameba-doc-arduino-sdk/)
+
+## Readthe Docs
+Click the following URLs to view the documentations of all Arduino SDK supported EVBs.
+- Ameba Arduino SDK Documents: [https://ameba-doc-arduino-sdk.readthedocs-hosted.com/en/latest/](https://ameba-doc-arduino-sdk.readthedocs-hosted.com/en/latest/)
+
+-----------------------------------------------------------------------------------------
+
+## Introduction
+This repository contains the technical documentations for Realtek Ameba AIoT Arduino EVBs, including:
+- AmebaPro2
+  - AMB82-mini
+- AmebaD
+  - AMB21 / AMB22
+  - AMB23
+  - AMB25
+  - AMB26
+  - BW16
+  - BW16 typec
+  - AW-CU488 
+
+The technical documentation of every boards include but is not limited to the following parts：
+- Product Overview
+- Application Note
+- API docuemnts
+- Getting started 
+- Application example guides
+- FAQ
+
+## SDK
+The SDK related to the documentation can be downloaded from:
+- AmebaPro2: [https://github.com/Ameba-AIoT/ameba-arduino-pro2](https://github.com/Ameba-AIoT/ameba-arduino-pro2)
+- AmebaD: [https://github.com/Ameba-AIoT/ameba-arduino-d](https://github.com/Ameba-AIoT/ameba-arduino-d)
+
+## Feedback
+- If you find a bug or any error, you can directly create a Pull Request/Issue on GitHub.
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 [backup link](https://ameba-arduino-doc.readthedocs.io/en/latest/)