Add code of conduct

Because it's the hip thing to do these days

CODE_OF_CONDUCT.md

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+# [:cow:]: The Code of the West
+
+## Ten principles to live by
+
+1. Live each day with courage.
+2. Take pride in your work.
+3. Always finish what you start.
+4. Do what has to be done.
+5. Be tough, but fair.
+6. When you make a promise, keep it.
+7. Ride for the brand.
+8. Talk less and say more.
+9. Remember that some things aren't for sale.
+10. Know where to draw the line.