added README

README.md

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+# Latex Spellcard generator
+
+This script generates spellcard from a certain format of json.
+There is an example in `data/sample.json`.
+
+The cards are compact and could be printed on A4 (10 per page).
+
+The end result looks like this:
+
+![Sample](sample.png)
+
+## Calling
+
+```
+python genspells.py --spells data/sample.json -2 Wizard
+```