Anyone want to contribute in the Proteus design files, or want to resolve issues are free to do, make sure you improve it. Also If you want to contribute to make documentation for this, or addind screenshots(previews) of the designs and make them display through README.md in individual directory, you are free to contribute. Make sure you Create a new branch for your commit and start a pull request with proper comments and explaination. I am still learning how to use GIT, if I say or do something wrong, feel free to point it out.