add env.sample with all supported OLLIE_* variables

env.sample

@@ -0,0 +1,29 @@
+# ollie environment configuration sample
+# Copy to ~/.config/ollie/env and fill in values.
+# Variables already set in the shell environment take precedence over this file.
+
+# Backend selection (required)
+# Supported: ollama | openai | openrouter | anthropic | copilot | kiro | gemini
+OLLIE_BACKEND=ollama
+
+# Ollama
+OLLIE_OLLAMA_URL=http://localhost:11434
+
+# OpenAI / OpenAI-compatible (openai, openrouter)
+OLLIE_OPENAI_URL=
+OLLIE_OPENAI_KEY=
+
+# Anthropic
+OLLIE_ANTHROPIC_KEY=
+
+# Google AI Studio (gemini)
+# Obtain a key at https://aistudio.google.com/apikey
+# Falls back to OLLIE_OPENAI_KEY if unset.
+OLLIE_GEMINI_KEY=
+
+# GitHub Copilot
+OLLIE_COPILOT_TOKEN=
+
+# Kiro / CodeWhisperer
+# Accepts a bearer token or a sqlite:// URL; auto-detected from Kiro CLI data dir if unset.
+OLLIE_KIRO_TOKEN=