Add requirements

requirements.txt

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+backports.functools-lru-cache==1.5
+BTrees==4.5.1
+chardet==3.0.4
+cheroot==6.5.2
+CherryPy==18.0.1
+coloredlogs==10.0
+deb-pkg-tools==4.5
+executor==21.2
+fasteners==0.14.1
+humanfriendly==4.16.1
+jaraco.functools==1.20
+Jinja2==2.10
+MarkupSafe==1.0
+monotonic==1.5
+more-itertools==4.3.0
+persistent==4.4.2
+portend==2.3
+property-manager==2.3.1
+python-debian==0.1.33
+python-memcached==1.59
+pytz==2018.5
+six==1.11.0
+tempora==1.13
+transaction==2.2.1
+verboselogs==1.7
+zc.lockfile==1.3.0
+ZConfig==3.3.0
+ZODB==5.5.0
+zodbpickle==1.0.2
+zope.interface==4.5.0