feat: add M5Stack AtomS3R Echo Pyramid board (#1959)

Made-with: Cursor

main/boards/atoms3r-echo-pyramid/README.md

@@ -0,0 +1,51 @@
+# 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 AtomS3R + Echo Pyramid
+```
+
+**修改 flash 大小：**
+
+```
+Serial flasher config -> Flash size -> 8 MB
+```
+
+**修改分区表：**
+
+```
+Partition Table -> Custom partition CSV file -> partitions/v2/8m.csv
+```
+
+**修改 psram 配置：**
+
+```
+Component config -> ESP PSRAM -> SPI RAM config -> Mode (QUAD/OCT) -> Octal Mode PSRAM
+```
+
+**编译：**
+
+```bash
+idf.py build
+```
+
+## 使用说明
+
+Echo Pyramid 正常运行时请从 Pyramid 底座的 USB-C 口供电；AtomS3R 的 USB-C 口主要用于烧录。
+
+# 参考资料
+
+https://github.com/m5stack/M5Echo-Pyramid