Create CONTRIBUTING.md

Author: swharden

CONTRIBUTING.md

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+# Contributing to pyABF
+
+**pyABF welcomes contributions from the open source community!** The following information may make it easier to get started working with pyABF source code.
+
+## Development Environment Setup
+
+When working with Python projects I prefer the [VS Code editor](https://code.visualstudio.com/)
+
+Install the latest version of Python from https://python.org
+
+In a terminal, `cd` into this repository's top-level folder
+
+Create a virtual environment: `python -m venv env`
+
+Activate the virtual environment: `"env/Scripts/activate"`
+
+Install the required packages: `pip install -r "src/requirements.txt"`
+
+## Running Tests
+
+In a terminal, `cd` into this repository's top-level folder
+
+Activate the virtual environment: `"env/Scripts/activate"`
+
+Run the tests: `pytest`