Update instruction of compiling MMT-DPI from its source code

docs/docs/guide/building-from-source/readme.md

@@ -6,7 +6,9 @@ Suppose on your machine installed Ubuntu 18.04, you have:
 
 - *gcc, make, git, libxml2-dev, libpcap-dev, libconfuse-dev libsctp-dev* :  `sudo apt update && sudo apt install gcc make git libxml2-dev libpcap-dev libconfuse-dev libsctp-dev`
 - *the source code on your machine*: `git clone https://github.com/montimage/5greplay.git`
-- [*mmt-dpi*](https://github.com/Montimage/mmt-dpi): `wget https://github.com/Montimage/mmt-dpi/releases/download/v1.7.9/mmt-dpi_1.7.9_8694eaa_Linux_x86_64.deb && sudo dpkg -i ./mmt-dpi*.deb && sudo ldconfig`
+- [*mmt-dpi*](https://github.com/Montimage/mmt-dpi):
+  -  If you use latest version of Ubuntu, then you can use its pre-compiled [Debian packages](https://github.com/Montimage/mmt-dpi/releases), for example : `wget https://github.com/Montimage/mmt-dpi/releases/download/v1.7.9/mmt-dpi_1.7.9_8694eaa_Linux_x86_64.deb && sudo dpkg -i ./mmt-dpi*.deb && sudo ldconfig`
+  -  Otherwise, you can [compile MMT-DPI from its source code](https://github.com/Montimage/mmt-dpi/blob/master/docs/Compilation-and-Installation-Instructions.md), for example: `sudo apt-get update && sudo apt-get install -y gcc make build-essential git cmake libxml2-dev && git clone https://github.com/montimage/mmt-dpi && cd mmt-dpi/sdk && make && sudo make install`
 
 ## Clean