added requirements file

ADoutputs.py

@@ -21,7 +21,7 @@ try:
     from props.digital import DigitalProps
     from props.ao import AnalogOutputProps    
 
-except ValueError:
+except:
     warnings.warn('Problem importing ul from mcculw, Thus might happen in Linux')
     import uldaq as ul
     from uldaq import InterfaceType

readme.md

@@ -9,7 +9,7 @@ These instructions will get you a copy of the project up and running on your loc
 
 In windows, the mcculw package is needed. You can install it from https://pypi.org/project/mcculw/
 
-In Linux, you will need the mccdaq package. You can install it from https://pypi.org/project/uldaq/. 
+In Linux, you will need the mccdaq package. You can install it from https://pypi.org/project/uldaq/. There you should go to the github repository and follow the build instructions. 
 
 However, until futher notice, the app will only be working properly under Windows. In Linux it can be tested thou, but without connecting to any device. In this case, the outputs are printed on 
 the console. 

requirements.txt

+pyqtgraph
+cv2