add README

rt-thread/README.md

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+TinyUSB for RT-Thread Port
+==========================
+
+[中文](./README_ZH.md) | English
+
+TinyUSB is an open source cross-platform USB stack for embedded system.
+
+1、 Getting start
+-----------------
+
+The specific path in RT-Thread package manager is as follows:
+
+``` {.sourceCode .text}
+-> RT-Thread online packages
+    -> system packages
+        --- TinyUSB (offical): an open source cross-platform USB stack for embedded system
+            (2048) TinyUSB thread stack size
+            [*]   Using USB device  ---->
+                [*]   Using Communication Device Class (CDC)
+                [*]   Using Mass Storage Class (MSC)
+                ()      The name of the device used by MSC
+                  Version (latest)  --->
+```
+
+The configuration instructions for each function are as follows:
+
+-   TinyUSB thread stack size
+-   Whether to use a USB device
+-   Using CDC
+-   Using MSC
+-   Name of the block device used for MSC read/write
+
+Then let the RT-Thread package manager automatically update, or use the
+`pkgs --update` command to update the package to the BSP.
+
+2、Support
+----------
+
+### 2.1、MCU
+
+Currently only the STM32 family of MCUs is supported.
+
+### 2.2、Device class
+
+-   Communication Device Class (CDC)
+-   Mass Storage Class (MSC)
+
+3、Feedback
+-----------
+
+issue: [tfx2001/tinyusb](https://github.com/tfx2001/tinyusb/issues)

rt-thread/README_ZH.md

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+TinyUSB for RT-Thread Port
+==========================
+
+中文 | [English](./README.md)
+
+TinyUSB 是一个用于嵌入式设备的跨平台 USB 协议栈。
+
+1、 打开 TinyUSB
+----------------
+
+RT-Thread 包管理器中的路径如下：
+
+``` {.sourceCode .text}
+-> RT-Thread online packages
+    -> system packages
+        --- TinyUSB (offical): an open source cross-platform USB stack for embedded system
+            (2048) TinyUSB thread stack size
+            [*]   Using USB device  ---->
+                [*]   Using Communication Device Class (CDC)
+                [*]   Using Mass Storage Class (MSC)
+                ()      The name of the device used by MSC
+                  Version (latest)  --->
+```
+
+功能配置说明如下：
+
+-   TinyUSB 线程栈大小
+-   是否使用 USB 设备
+    -   是否使用 CDC
+    -   是否使用 MSC
+    -   用于 MSC 读写的块设备名字
+
+然后让 RT-Thread 的包管理器自动更新，或者使用 `pkgs --update`
+命令更新包到 BSP 中。
+
+2、支持情况
+-----------
+
+### 2.1、MCU
+
+目前仅支持 STM32 系列 MCU。
+
+### 2.2、设备类
+
+-   通信设备类（CDC）
+-   大容量存储设备（MSC）
+
+3、Feedback
+-----------
+
+issue: [tfx2001/tinyusb](https://github.com/tfx2001/tinyusb/issues)