Added instructions for Windows

README.md

@@ -21,9 +21,9 @@ In the following we give hints on how to install relevant packages.
 
 ToDo:
 Linux Mint: Ubuntu based
-Arh Linux. Has a couple of derivatives. We will assume they are equal...
+Arch Linux. Has a couple of derivatives. We will assume they are equal...
 
-### Other Unices
+### Other Unixes
 gfortran and the lapack implementation from netlib.org should be available for
 your system. Consult the documentation of your system on how to install the
 relevant packages. The package names from linux should give good starting points
@@ -32,6 +32,27 @@ for your search.
 ### MacOS
 
 ### Windows
+The easiest way to compile Fortran code in Windows is trough Cygwin, which 
+provides a Unix-like environment for Windows. The installer also works as a 
+package manager, providing an extensive collection of software from the Unix 
+ecosystem. For convenience, we provide a zip archive containing the Cywin
+installer and a local repository with all the additional software needed for 
+ALF. 
+
+Steps for installing Cygwin:
+- Unizip the archive
+- Execute "setup-x86_64.exe". If administrator rights are missing, execute it 
+from the command line as "setup-x86.exe --no-admin".
+- In the setup choose "Install from local directory".
+- Choose root directory, where cygwin will be installed. In this directory you 
+will also find the home directory of the Unix environment.
+- Choose the diretory "cygwin_ALF" as local package Directory.
+- At the "Select Packages" screen, in "Categories" view, at the line marked 
+"All", click on the word "default" so that it changes to "install".
+- Finish installation
+- To add, remove or update installed packages, rerun the installer setup and 
+chose "Install from Internet".
+
 
 ## Editors
 For the coding parts of the exercises we recommend to use a text editor.