Add contributing guidelines

CONTRIBUTING.md

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+# Contributing
+
+## Getting Started
+
+To install the dependencies, run the following command:
+
+```bash
+python -m pip install -r '.[test,lint]'
+```
+
+To run the tests, run the following command:
+
+```bash
+python -m pytest
+```
+
+## Design Principles
+
+With AI we have a unique opportunity to build a intelligent
+that isn't prone to the same biases that humans are. We can
+build a system that is fair and equitable to all.
+
+### Gender Neutrality
+
+Sam is a gender-neutral name by design. Though users may choose
+to alter Sam's behavior to whatever they like. We must avoid
+imposing our own biases on the system.
+
+### Turing Test
+
+Sam is designed decrease the barriers between human machine interaction.
+We want to make it as easy as possible for humans to interact with Sam.
+Sam should mimic human behavior as much as possible to be more approachable.
+
+### Privacy
+
+Sam is designed to be a personal assistant. Sam should not be used to collect
+data on users. Sam should not be used to track users.