Add readme

README.md

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+# Taurus - A Concurrent Gemini Server
+
+## Building
+
+```sh
+cargo build --release
+cp target/release/taurus /usr/bin/taurus
+```
+
+## Generating a test-certificate
+
+At the current state of the project, you need to generate a server certificate by hand. Take a look at `contrib/generate_cert.sh`, and run it.
+
+## Testing
+
+There is a diagnostics script at `contrib/diagnostics.py` that can be used to test the functionality of taurus.