Readme + TODO

readme.md

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+# Arkhéïa Spreadsheet Importer
+
+```
+usage: import-spreadsheet SPREADSHEET OUTPUT_FILE
+```
+
+Note, we make the assumption we're both using `nix-shell` **and** a python virtualenv 🙃. (a dep was broken on NixPkgs, I was too lazy to fix it.)
+
+TODO:
+
+    - Relax the dependency on Nix.
+    - Try that on a Windows computer.

requirements.txt

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+pyexcel-ods