add basic requirements files

requirements/requirements-dev.in

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+-r requirements.in
+
+pip-tools

requirements/requirements-dev.txt

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+#
+# This file is autogenerated by pip-compile
+# To update, run:
+#
+#    pip-compile --output-file=requirements/requirements-dev.txt requirements/requirements-dev.in
+#
+click==7.0                # via pip-tools
+npyscreen==4.10.5
+pip-tools==4.4.1
+six==1.14.0               # via pip-tools

requirements/requirements.in

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+npyscreen

requirements/requirements.txt

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+#
+# This file is autogenerated by pip-compile
+# To update, run:
+#
+#    pip-compile --output-file=requirements/requirements.txt requirements/requirements.in
+#
+npyscreen==4.10.5