docs:updata BoAT_User_Guide_en.md
add shell commands of Ubuntu
@@ -125,6 +125,19 @@ BoAT IoT Framework SDK depends on the following software:
| curl | libcurl and its development files (7.55.1 is tested) | Required on Linux default | Required on Linux default |
Before compiling the SDK and using it, you need to make sure that these software have been installed. On Ubuntu, can use the apt install command to install the corresponding package. Under Cygwin, use the Setup program that comes with Cygwin to install.
+E.g.:
+- Ubuntu
+````
+sudo apt install python
+download curl-7.55.1.tar.xz : https://curl.se/download/curl-7.55.1.tar.xz
+tar -xvf ./curl-7.55.1.tar.xz
+cd curl-7.55.1
+./configure -enable-smtp -enable-pop3
+make
+sudo make install
+sudo apt-get install libcurl4-openssl-dev
+````
+
Under Windows, the SDK does not support compilation in environments other than Cygwin. If you must run outside of Cygwin (for example, a cross-compiler using Windows as the Build environment), please refer to [Use Windows as Compiler Environment](#Use-Windows-As-CompilerE-nvironment) chapter to adjust the compiled files.
