Add Gemini CLI install instructions to README

README.md

@@ -71,6 +71,18 @@ Fetch and follow instructions from https://raw.githubusercontent.com/obra/superp
 
 **Detailed docs:** [docs/README.opencode.md](docs/README.opencode.md)
 
+### Gemini CLI
+
+```bash
+gemini extensions install https://github.com/obra/superpowers
+```
+
+To update:
+
+```bash
+gemini extensions update superpowers
+```
+
 ### Verify Installation
 
 Start a new session in your chosen platform and ask for something that should trigger a skill (for example, "help me plan this feature" or "let's debug this issue"). The agent should automatically invoke the relevant superpowers skill.