add readme

README.md

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+# Arduino digicode brutforce interpretor
+
+## Subject
+
+## Usage
+
+1. You can modify the passcode of the digicode by changing the variable ``CODE`` in the file ``src/pin_handler.h``
+
+*Note that the passcode must end with a '#'*
+
+2. Run the command ``make prepare``
+3. Give this repository to your student but make sure not to give the ``src/pin_handler.h`` file or to change the passcode you compiled with
+4. To test the ``student.ino`` just run ``make run``
+
+## Warning
+
+This is a very very basic parser, and so it will not work with a certain number of cases:
+* if you don't use the variable for the pin numbers
+* if you write 'digitalWrite()' on several lines
+* if you move the loop() opening bracket on the next line
+* ...