add sleep for checking render success, add readme

readme.md

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+# i2v (Image to Video)
+
+I2V is a tool for converting a still image into a video. It uses the Stability.ai API to generate a video from a single image.
+
+You can find the API documentation here: https://platform.stability.ai/docs/api-reference#tag/v2alphageneration/paths/~1v2alpha~1generation~1image-to-video/post
+
+## Usage
+
+To build the binary run:
+
+```bash
+go build -o i2v i2v/cmd/cli
+```
+
+To run the binary:
+
+Set the `STABILITY_API_KEY` environment variable to your API key.
+
+```bash
+./i2v -o <path to output video> <path to input image>
+```