添加 '编译须知.md'

编译须知.md

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+1：到[msys2官网](https://www.msys2.org/) 下载msys2\
+2：将代码克隆到本地\
+3：切换到所克隆的目录(在msys2中)\
+4：执行：\
+```
+pacman -Syu 
+pacman -S mingw-w64-x86_64-g++ 
+pacman -S mingw-w64-x86_64-gcc 
+```
+
+5:编译：\
+```
+g++ time_get.cpp -o time_get.exe 
+g++ class_form.cpp -o class_form.exe 
+g++ audio_control.cpp -o 1_control.exe 
+g++ msg_control.cpp -o msg_control.exe 
+```
+
+#更多内容可以看我在[Bilibili上发的视频](https://www.bilibili.com/video/BV1qF411X7hh)