README: update some stuff

README.md

@@ -1,19 +1,37 @@
 # ems-qart
 A Qt application to flash EMS 64M cartridges
 
+## Linux installation
+Go to the [latest release](https://github.com/rbino/ems-qart/releases/latest) and download the .deb package
+
+Install it with
+```
+dpkg -i packagename.deb
+sudo apt -f install
+```
+Then type `ems-qart` in a terminal to start the program
+
+## Windows installation
+Go to the [latest release](https://github.com/rbino/ems-qart/releases/latest) and download the zip for Windows
+
+Unzip it then follow the instructions written in README.txt
+
+## Mac OSX installation
+Coming soon
+
 ## Building on Linux
-Install the dependencies.  
+Install the dependencies
+
 On Debian/Ubuntu
 ```
-sudo apt install build-essential qtbase5-dev qtdeclarative5-dev libusb-1.0-0-dev qml-module-qtquick2 qml-module-qtquick-controls qml-module-qtquick-dialogs
+sudo apt install build-essential pkg-config qtbase5-dev qtdeclarative5-dev libqt5svg5-dev qt5-qmake qt5-default libusb-1.0-0-dev qml-module-qtquick2 qml-module-qtquick-controls qml-module-qtquick-dialogs
 ```
+
 Then navigate to the folder where you cloned the repo and
 ```
 mkdir build
 cd build
 qmake ..
 make
+sudo make install
 ```
-
-## Building on other platforms
-Coming soon...