Update README.md

Added installation commands for linux and windows.

README.md

@@ -8,6 +8,21 @@ proofs, and supports a use model in which the human protocol designer
 and the automated tool interact to expose errors and prove
 correctness.
 
+#Installation
+Linux
+On Debian-based linux ditributions such as Ubuntu, download and install the file ms-ivy_X.X_YYYY.deb where X.X is the IVy version and YYYY is the machine architecture. Use your system’s package manager to install this package, or the following commands:
+```
+$ sudo dpkg -i ms-ivy_X.X_YYYY.deb
+$ sudo apt-get install -f
+```
+The first command will report missing dependencies, which will be installed by the second command.
+
+Windows
+The Windows binary distribution is in the form of a zip archive. Download the file ivy.X.Y-.Windows-z86.zip, where X.X is the IVy version (this will work on both 32-bit and 64 bit Intel Windows). Use Windows Explorer to extract this archive in the directory C:\. This should give you a directory C:\ivy. To use IVy in a command window, first execute this command:
+```
+> C:\ivy\scripts\activate
+```
+
 ## Further Reading
 
 For further information on IVy, see [the IVy web site](http://microsoft.github.io/ivy/).