Update README on how to build on Debian 8

+ typo fixes

README.md

@@ -14,7 +14,7 @@ of kiwix.
 Most of the compilation steps are handled by the kiwix-build.py
 script.
 
-This script has been tested of Fedora 23 and Ubuntu 16.10
+This script has been tested on Fedora 23, Ubuntu 16.10 and Debian 8
 
 If you want to cross-compile for other platforms as windows or android, you
 should read the "Other target platform" section.
@@ -28,14 +28,17 @@ them with your package manager.
 Else you can install them manually
 
 ### Meson
+You need to install python 3 and pip. On debian and ubuntu, they are provided by the package python3-pip
 
 ```
-pip install meson --user # Install Meson
+pip3 install meson --user # Install Meson
+cp ~/.local/bin/meson <a_directory_in_your_path>
 ```
 
 (You may want to install meson in a virtualenv if you prefer)
 
 ### ninja
+You need git to be installed
 
 ```
 git clone git://github.com/ninja-build/ninja.git
@@ -48,16 +51,17 @@ cp ninja <a_directory_in_your_path>
 ## Buildings
 
 This is the simple one.
+You need pkg-config to be installed
 
 ```
 ./kiwix-build.py
 ```
 
 It will compile everything.
-If you are using a supported platform (redhad or debian based) it will install
+If you are using a supported platform (redhat or debian based) it will install
 missing packages using sudo.
 If you don't want to trust kiwix-build.py and give it the root right, just
-launch yourself the the printed command.
+launch yourself the printed command.
 
 ### Outputs