Add Doxygen documentation

[johnathanchann]

Before merging here are the few things required to setup

1. Setting up Gh-pages branch

• Go to your mcpp directory and create an empty branch named gh-pages and run the commands

git checkout --orphan gh-pages
git rm -rf .
git commit --allow-empty -m "init"
git push origin gh-pages```

2. Setup github gh-pages on github settings

Settings > pages > Build and deployment > sources > select deploy from a branch
branch > select gh-pages >select /root dir

3. Change your URL in readme.md

• So for this version i have setup the link so that the dictionary page is the current temporary main page for v1.
• Just replace INSERT_YOUR_URL with your url, please do not replace the html dir
• Default URL would be https://YOUR_GITHUB_NAME.github.io/mcpp/

[johnathanchann]

Please ignore the deploy-doxygen error, this is due to the repository is not merged and thus the gh-pages branch is inaccessible. It will work fine after merging

[rozukke]

Thank you for this sizeable contribution, which should hopefully be a step forward in the quality of the docs. I've included some changes that should be made before this can be merged.

[johnathanchann]

Resolved changes as per requested. Cheers

[rozukke]

Thanks for quick response, will merge and test now.