doc: update README.md for latest changes

Signed-off-by: Huaqi Fang <[email protected]>

README.md

@@ -2,6 +2,14 @@
 
 [![Build Examples](https://github.com/Nuclei-Software/platform-nuclei/actions/workflows/build.yml/badge.svg?branch=feature%2Fgd32vw55x)](https://github.com/Nuclei-Software/platform-nuclei/actions/workflows/build.yml)
 
+> [!NOTE]
+> If you want to use **platform-nuclei** with latest nuclei sdk(>=0.6.0) and toolchain offline, please follow
+> the steps list in [.github/workflows/build.yml](.github/workflows/build.yml).
+>
+> And you can also take a try with **Nuclei Studio IDE**, which is built on Eclipse embedded CDT, see https://www.nucleisys.com/download.php#tools
+>
+> If you want **better online platformio support for you and your customer**, **highly recommended** to use https://registry.platformio.org/ 
+
 [Nuclei System Technology](https://www.nucleisys.com/) is a professional RISC-V IP product company.
 It provides various RISC-V IP products which can meet the requirements of the AIoT era.
 It is the first RISC-V Core IP provider company in Mainland China, launchs the world's