add cores3 guide

main/boards/m5stack-core-s3/README.md

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+# 编译配置命令
+
+**配置编译目标为 ESP32S3：**
+
+```bash
+idf.py set-target esp32s3
+```
+
+**打开 menuconfig：**
+
+```bash
+idf.py menuconfig
+```
+
+**选择板子：**
+
+```
+Xiaozhi Assistant -> Board Type -> M5Stack CoreS3
+```
+
+**修改 psram 配置：**
+
+```
+Component config -> ESP PSRAM -> SPI RAM config -> Mode (QUAD/OCT) -> Quad Mode PSRAM
+```
+
+**编译：**
+
+```bash
+idf.py build
+```