Add requirements file

requirements.txt

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+asn1crypto==0.24.0
+attrs==19.1.0
+Automat==0.7.0
+cffi==1.12.3
+constantly==15.1.0
+cryptography==2.7
+csiphash==0.0.5
+hyperlink==19.0.0
+idna==2.8
+incremental==17.5.0
+numpy==1.17.2
+pyasn1==0.4.6
+pyasn1-modules==0.2.6
+pycparser==2.19
+PyHamcrest==1.9.0
+pyOpenSSL==19.0.0
+PyYAML==5.1.2
+redis==3.3.8
+service-identity==18.1.0
+six==1.12.0
+Twisted==19.7.0
+zope.interface==4.6.0