create requirements.txt

The standard requirements files for listing dependencies in
Python. Nothing to add here... all standard stuff.

requirements.txt

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+cairocffi==1.2.0
+certifi==2020.12.5
+cffi==1.14.5
+chardet==4.0.0
+cycler==0.10.0
+idna==2.10
+kiwisolver==1.3.1
+matplotlib==3.3.4
+numpy==1.20.1
+Pillow==8.1.2
+pkg-resources==0.0.0
+pycparser==2.20
+pyparsing==2.4.7
+python-dateutil==2.8.1
+requests==2.25.1
+six==1.15.0
+tk==0.1.0
+urllib3==1.26.4