Update README

README.md

@@ -1,9 +1,39 @@
-## Builder
+# jupyter-repo2docker
 
-**Note**: The project will probably be renamed soon!
+**jupyter-repo2docker**, a command line tool, builds a docker image from a git
+repository and can push the image to a docker registry.
 
-A simple commandline tool that builds a docker image off a git repository & pushes it to a docker registry.
+## Installation
 
-It mostly relies on other tools ([Source to Image](https://github.com/openshift/source-to-image) or just docker)
-for doing the actual building. It is a simple wrapper that does detection to figure out which
-build method to use, and how to invoke that build method.
+To install from pypi, the python packaging index:
+
+```bash
+python3 -m pip install jupyter-repo2docker
+```
+
+To install from source:
+
+```bash
+git clone https://github.com/jupyterhub/jupyter-repo2docker.git
+cd jupyter-repo2docker
+python3 -m pip install .
+```
+
+## Usage
+
+To access help for the application:
+
+    jupyter-repo2docker -h
+
+## Technical Overview for Contributors
+
+**jupyter-repo2docker** uses other tools
+([Source to Image](https://github.com/openshift/source-to-image) or just docker)
+for doing the actual building of the image.
+
+The `repo2docker` directory contains the application which detects which build
+method to use, and how to invoke that build method.
+
+The `s2i-builders` directory contains builder images which can be used to
+provide custom `conda` and `venv` environments suitable for running
+**JupyterHub**.