README: basic instructions

README.md

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+# Semantic search demo
+
+Start ollama docker (podman) image:
+
+```
+podman run -d -v models:/root/.ollama -p 11434:11434 --name ollama ollama/ollama
+podman exec -ti ollama ollama pull nomic-embed-text
+```
+
+Needs `uv` to work
+
+```
+py -m uv run main.py test
+```