bootstrap/README.md: add README.md

Signed-off-by: Joe Guo <joeg@catalyst.net.nz>
Reviewed-by: Douglas Bagnall <douglas.bagnall@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>

bootstrap/READMD.md

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+# Samba Bootstrap
+
+A pure python3 module with CLI to bootstrap Samba envs for multiple distributions.
+
+## Features
+
+- manage Samba dependencies list for multiple distributions
+- render dependencies package list to boostrap shell scripts(apt, yum and dnf)
+- render Vagrantfile to provision vitual machines with bootstrap scripts
+- render Dockerfile to build docker images with bootstrap scripts
+- build/tag/push docker images
+
+## Supported Distributions
+
+deb: Debian 7|8|9, Ubuntu 1404|1604|1804
+rpm: CentOS 6|7, Fedora 28|29
+
+Easy to add more.
+
+## Usage
+
+Render files:
+
+    ./template.py --render
+
+By default, files are rendered into `files` directory in current dir.
+
+Build docker images:
+
+    ./docker.py --build
+
+Tag docker images:
+
+    ./docker.py --tag --prefix registry.gitlab.com/samba-team/samba
+
+Push docker images(you need to have permission):
+
+    docker login
+    ./docker.py --push --prefix registry.gitlab.com/samba-team/samba
+
+the prefix defaults to `registry.gitlab.com/samba-team/samba`, and you can
+override it with env var `SAMBA_DOCKER_IMAGE_NAME_PREFIX`.
+
+## User Stories
+
+As a gitlab-ci maintainer, I can use this tool to build the CI docker images.
+I can also automate it.
+
+As a Samba developer/tester, I can setup a Samba env very quickly.
+
+With Docker:
+
+    cd ~/samba
+    git clean -xdf
+    docker run -it -v $(pwd):/home/samba/samba samba-ubuntu1604:latest bash
+
+With Vagrant:
+
+    cd ./files/
+    vagrant up   # start all
+    vagrant up debian9  # start one
+    vagrant ssh debian9
+    vagrant destroy debian9  # destroy one
+    vagrant destroy  # destroy all
+
+Or a remote/cloud machine:
+
+    scp ./files/fedora29/bootstrap.sh USER@IP:
+    ssh USER@IP
+    sudo bash ./bootstrap.sh
+