Add requirements.txt

requirements.txt

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+attrs==21.3.0
+brother-ql==0.9.4
+click==8.0.3
+future==0.18.2
+numpy==1.21.5
+packbits==0.6
+pandas==1.3.5
+Pillow==8.4.0
+python-dateutil==2.8.2
+pytz==2021.3
+pyusb==1.2.1
+qrcode==7.3.1
+six==1.16.0