Add instructions for running app

Author: Tania Allard

session5/instructions.md

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+# How do I get the API (web) app in my local computer?
+
+You should now have a copy of this course repository in your
+local computer. The most important thing is to make sure your
+local copy is up to date with our version (your Python instructors).
+
+If you are using GitKraken:
+1. Open GitKraken and make sure you are on the master branch of the 'Shef_CodeFirst_Python'(remember this is displayed on the top left corner of the app).
+2. Click on the pull icon and you should then see the usual blue pop over saying your version is up to date.
+3. You are ready to go!
+
+If you're using the command line:
+1. Navigate to your local copy of the repository
+2. Make sure your local copy is up to date by typing `git pull`
+3. That's it!
+
+Once you have updated your local repository you should be able to see a `session5` directory