There are a number of keyboard shortcuts in System Settings > Keyboard > Windows, but to add more of them you will need a tool called dconf-editor.
To install this tool open a Terminal and copy/paste next line :
sudo apt-get install dconf-tools
Applications > dconf Editor
Navigate to org > gnome > desktop > wm > keybindings
We are going to add keyboard shortcuts to place windows in these different directions :
Keys that are used : Super ( Windows ) and Keypad numbers.
Assign the following shortcuts :