requirements.txt: Adding Python package requirements file

requirements.txt

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+attrs==21.2.0
+click==7.1.2
+cocotb==1.5.2
+cocotb-bus==0.1.1
+colorama==0.4.4
+commonmark==0.9.1
+cycler==0.10.0
+decorator==4.4.2
+iniconfig==1.1.1
+kiwisolver==1.3.1
+Mako==1.1.4
+MarkupSafe==1.1.1
+matplotlib==3.3.4
+networkx==2.5
+numpy==1.20.1
+packaging==20.9
+Pillow==8.1.1
+pluggy==0.13.1
+py==1.10.0
+pydot==1.4.2
+Pygments==2.7.4
+pygraphviz==1.7
+pyparsing==2.4.7
+pytest==6.2.4
+python-dateutil==2.8.1
+pyvcd==0.2.4
+rich==9.10.0
+schemdraw==0.9.1
+simpy==4.0.1
+six==1.15.0
+toml==0.10.2
+typing-extensions==3.7.4.3