update README

README.md

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 # harrison-ai-terraform-docker
 Lightweight Docker image including Terraform CLI and AWS CLI
+
+## 💡 Motivation
+Our goal is to create a **minimalist** and **lightweight** Docker image with the tools listed below in order to reduce network and storage impact.
+
+## 🔧 What's inside ?
+
+The image is based on the [official Python 3 Docker image](https://hub.docker.com/_/python), with the following additional tools included:
+
+* [Terraform CLI](https://www.terraform.io/docs/commands/index.html)
+* [AWS CLI](https://aws.amazon.com/cli/)
+* [Git](https://git-scm.com/)
+
+## 🚀 Usage
+
+To launch the Terraform CLI:
+
+```bash
+docker run -it -v ${PWD}:/workspace harrisonai/terraform:latest
+```
+
+## 📖 License
+This project is licensed under [Apache License 2.0](https://raw.githubusercontent.com/harrison-ai/harrison-ai-terraform-docker/master/LICENSE)