docs: adds installing instruction to readme

cristianoliveira · cristianoliveira · commit 1da9fbb1ee39 · 2025-04-28T12:30:37.000+02:00
diff --git a/README.md b/README.md
@@ -48,6 +48,12 @@ yay -S opencode-bin
 paru -S opencode-bin
 ```
 
+### Using nix flakes
+
+```bash
+nix profile install 'github:opencode-ai/opencode'
+```
+
 ### Using Go
 
 ```bash
