Add a Readme

Signed-off-by: Clement Verna <cverna@tutanota.com>

README.md

@@ -0,0 +1,47 @@
+fedora-container-release
+========================
+
+This project is a Command Line Interface (CLI) tool which fetch the Fedora container base image
+rootfs from [Fedora's build system](https://koji.fedoraproject.org) and prepares it to be pushed to
+[docker-brew-fedora](https://github.com/fedora-cloud/docker-brew-fedora) repository which is used to
+update our images in the Docker Hub.
+
+This cli is currently used in a [GitHub action](https://github.com/fedora-cloud/docker-brew-fedora/blob/master/.github/workflows/main.yml) define in the docker-brew-fedora repo
+
+
+## Development
+
+To start hacking on that repository you need the Rust package manager Cargo installed on your local machine.
+
+## Clone the repository
+
+```
+$ git clone https://github.com/fedora-cloud/fedora-container-release.git
+$ cd fedora-container-release
+```
+
+## Run the application
+
+```
+$ cargo run -- --release 33
+```
+
+## Build a release binary
+
+```
+$ cargo build --release
+$ ll target/release/fedora-container-release
+$ target/release/fedora-container-release --help
+fedora-container-release 0.1.0
+
+USAGE:
+    fedora-container-release --release <release>
+
+FLAGS:
+    -h, --help       Prints help information
+    -V, --version    Prints version information
+
+OPTIONS:
+    -r, --release <release>
+```
+