Added instructions

README.md

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+# Assignments for Aalto Web Apps course
+This repository contains all the assignments repositories as submodules.
+
+##Cloning
+To clone locally, you must clone the main repository and update the submodules:
+
+  git clone git@github.com:aaltowebapps/assignments.git
+  cd assignments
+  git submodule init
+  git submodule update
+
+##Pulling the submodules updates from the main repository
+If you have already cloned the main repository, you can update the submodules in the following way:
+
+  git pull origin
+  git submodule update
+
+##Updating the submodules for the main repository
+The submodules are not automatically update but must be updated manually. First we must go to the submodule 
+to update, pull the new version and commit the main repository: 
+
+  cd <path to submodule>
+  git pull origin master
+  cd ..
+  git commit -am "Upgrading the submodule xxx"
+  git push origin 
+
+##Adding a submodule
+You can add a new submodule to the main repo in the following way:
+
+  git submodule add <url to git repor>
+  git add .
+  git commit -m "Added a new submodule"