Add basic README

README.md

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+# Karaokatalog
+
+Tools to manage an Ultrastar DX song library. Features include:
+
+1. Deduplication
+
+## Setup
+
+```bash
+python3 -m venv venv
+source venv/bin/activate
+pip install -r requirements.txt
+```
+
+## Run
+
+### Deduplication
+
+If your song library is stored at `/path/to/library`, run:
+
+```bash
+python3 -m karaokatalog.deduplicate /path/to/library
+```