Add README

README.md

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+### How do I load the dev environment?
+
+Pick your poison:
+
+    nix-shell
+    direnv allow
+
+Both require `nix` configured with a `nixpkgs` channel.
+
+### How to I get my user token?
+
+Log in using a browser, then grab it from the local browser DB.
+
+### How to I set my user token?
+
+Set it as the `CARDS_ACCESS_TOKEN` environment variable, somehow. ( Have a look at `.envrc` ;) )
+
+### How do I list my style ID's?
+
+    ./api.py get-styles | jq .[].id
+
+### How do I pull all my styles and cards?
+
+    ./pull.sh && find pvv/
+
+_(The pull is destructive.)_
+
+### How do I build a style?
+
+    make render-style-48-file
+
+Where `49` is the style ID.