feat: add gemini config, though unstable

Author: matscode

GEMINI.md

@@ -0,0 +1,10 @@
+# Interactive Coding Agent: Entry Point
+
+## 🚨 MANDATORY: START HERE
+
+**BEFORE ANY ACTION, YOU ARE REQUIRED TO:**
+
+1.  **OPEN** → **[rules/index.rules.md](./rules/index.rules.md)**
+2.  **FOLLOW** → The mandatory onboarding process described within.
+
+**FAILURE TO DO SO = CRITICAL VIOLATION**