Add a simple README.md

README.md

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+# cityEHR Documentation
+[![Build Status](https://github.com/cityehr/cityehr-documentation/actions/workflows/ci.yml/badge.svg)](https://github.com/cityehr/cityehr-documentation/actions/workflows/ci.yml)
+[![License](https://img.shields.io/badge/license-CC%20BY%20NC%20SA%204.0-blue.svg)](https://creativecommons.org/licenses/by-nc-sa/4.0/)
+
+This respository contains the documentation for cityEHR. The documentation is authored in [LwDITA](https://dita-lang.org/lwdita/capabilities/capabilities) XDITA format.
+
+When the source code of a document is updated in GitHub, we use GitHub Actions to automatically render a new HTML and PDF version of the documentation.
+
+
+## Documents
+
+| Title  | Source Location | Renderings |
+|---|---|---|
+| Quick Start Guide | [cityehr-quick-start-guide/src/main/lwdita/quickstart-guide-modular](cityehr-quick-start-guide/src/main/lwdita/quickstart-guide-modular) | [HTML](https://cityehr.github.io/cityehr-documentation/) / [PDF](https://cityehr.github.io/cityehr-documentation/quickstart-guide.pdf) |
+
+
+## Developing the Documentation
+
+If you wish to build the documentation on your own computer, you will need the following tools installed:
+
+* [Git](https://git-scm.com/)
+* [Java JDK](https://bell-sw.com/pages/downloads/) version 8 (or newer)
+* [Apache Maven](https://maven.apache.org/) 3.6 (or newer)
+
+1. If you have not already done so, clone the respoistory:
+```bash
+$ git clone https://github.com/cityehr/cityehr-documentation.git
+```
+
+2. Enter the clone folder:
+```bash
+$ cd cityehr-documentation
+```
+
+3. Run the following command to have Maven (mvn) render a new PDF and HTML version of the documentation:
+```bash
+$ mvn clean package -Pquick-start-guide-website
+```
+
+You can find the rendered versions of the documentation in the `target/` sub-folder of each module. For example:
+* `cityehr-quick-start-guide/target/quickstart-guide.pdf`
+* `cityehr-quick-start-guide/target/website/index.html`