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README.md

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+# dockerfile-image-tags
+
+[![version](https://img.shields.io/github/v/release/shivjm/dockerfile-image-tags?include_prereleases&sort=semver)](https://github.com/shivjm/dockerfile-image-tags/releases)
+[![semantic versioning](https://img.shields.io/badge/semantic%20versioning-2.0.0-informational)](https://semver.org/spec/v2.0.0.html)
+
+[![test](https://github.com/shivjm/dockerfile-image-tags/workflows/test/badge.svg)](https://github.com/shivjm/dockerfile-image-tags/actions?query=workflow%3Atest+branch%3Amain)
+
+A tool to list images and tags used in a Dockerfile.
+
+## Usage
+
+Pass path to Dockerfile:
+
+```sh
+dockerfile-image-tags path/to/Dockerfile
+```
+
+Or pass Dockerfile as input:
+
+```sh
+cat path/to/Dockerfile | dockerfile-image-tags
+```
+
+The output is a JSON array listing all images and tags found.