Add README.md

Signed-off-by: AnotherBot <cloud@anotherweb.it>

README.md

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+# AnotherOS
+
+Public keys for AnotherOS. Derivating from **Universal Blue** and **Fedora Silverblue**.
+
+## Cosign key
+
+To generate a pair:
+
+```bash
+COSIGN_PASSWORD="" cosign generate-key-pair
+```
+
+## More info
+
+[os.anotherweb.it](https://os.anotherweb.it) for all details.