Update contributing documentation
Update contributing documentation

  Fixes #159

snuggs/snuggsi,snuggs/snuggsi,snuggs/snuggsi,devpunks/snuggsi,devpunks/snuggsi,devpunks/snuggsi,devpunks/snuggsi,devpunks/snuggsi,snuggs/snuggsi