added reqs for binder

requirements.txt

@@ -0,0 +1,26 @@
+#
+# This file is autogenerated by pip-compile
+# To update, run:
+#
+#    pip-compile requirements.in
+#
+cycler==0.10.0
+    # via matplotlib
+kiwisolver==1.3.1
+    # via matplotlib
+matplotlib==3.3.4
+    # via -r requirements.in
+numpy==1.20.1
+    # via
+    #   -r requirements.in
+    #   matplotlib
+pillow==8.1.0
+    # via matplotlib
+pyparsing==2.4.7
+    # via matplotlib
+python-dateutil==2.8.1
+    # via matplotlib
+six==1.15.0
+    # via
+    #   cycler
+    #   python-dateutil