Add CODE_OF_CONDUCT

Signed-off-by: Thomas A. Christensen II <25492070+MillironX@users.noreply.github.com>

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+All contributors to Kelpie.jl are expected to live by the following ten
+principles:
+
+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