Add requirements

requirements.txt

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+alabaster==0.7.12
+Babel==2.7.0
+certifi==2019.9.11
+chardet==3.0.4
+docutils==0.15.2
+idna==2.8
+imagesize==1.1.0
+Jinja2==2.10.1
+MarkupSafe==1.1.1
+packaging==19.2
+pkg-resources==0.0.0
+Pygments==2.4.2
+pyparsing==2.4.2
+pytz==2019.2
+requests==2.22.0
+six==1.12.0
+snowballstemmer==1.9.1
+Sphinx==2.2.0
+sphinx-rtd-theme==0.4.3
+sphinxcontrib-applehelp==1.0.1
+sphinxcontrib-devhelp==1.0.1
+sphinxcontrib-htmlhelp==1.0.2
+sphinxcontrib-jsmath==1.0.1
+sphinxcontrib-qthelp==1.0.2
+sphinxcontrib-serializinghtml==1.1.3
+urllib3==1.25.6