Add environment example and README

.env.example

@@ -0,0 +1,3 @@
+FLOW2API_BASE_URL=https://flow2api.imbytecat.com/v1
+FLOW2API_API_KEY=
+FLOW2API_MODEL=gemini-3.0-pro-image-landscape

README.md

@@ -0,0 +1,30 @@
+# nano-banano
+
+To install dependencies:
+
+```bash
+bun install
+```
+
+Set up your environment:
+
+```bash
+cp .env.example .env
+```
+
+To run:
+
+```bash
+bun run src/index.ts "A tiny banana robot exploring a neon greenhouse"
+```
+
+What it does:
+
+- Reads `FLOW2API_BASE_URL`, `FLOW2API_API_KEY`, and `FLOW2API_MODEL` from `.env`
+- Accepts either a root endpoint or a `/v1` endpoint and normalizes root URLs to the OpenAI-compatible `/v1` base URL automatically
+- Also accepts older `GEMINI_MODEL` and `OPENAI_MODEL` env names for compatibility
+- Uses AI SDK's `streamText` for streaming text, then downloads the generated image from the streamed Markdown image link
+- Saves the generated image into `images/` with a timestamp-based filename
+- Keeps runtime code under `src/` and uses the `@/*` TypeScript alias for internal imports
+
+This project was created using `bun init` in bun v1.3.11. [Bun](https://bun.com) is a fast all-in-one JavaScript runtime.