adding DEVELOPER_README.md

Author: yaleman

DEVELOPER_README.md

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+# Getting started
+
+To get a copy of the code and run a test web server:
+
+1. [Fork the repository](https://github.com/projecthorus/sondehub-tracker/fork) by visiting [https://github.com/projecthorus/sondehub-tracker/fork](https://github.com/projecthorus/sondehub-tracker/fork).
+2. Clone the repository with your git tool of choice.
+3. Run `build.sh` to compile the javascript files. (This requires Java to be installed and in your path.)
+4. Run `python serve.py` to run a simple web server to (This requires python 3.x)
+5. Visit [http://localhost:8000](http://localhost:8000) to view the local version of the server!