This is a prototype of a simple template engine for HTML (although it can be used in other text environments as well), written in C++11 in 2015. Although it was used in production in another project back then, I don't consider it ready to be used.
It doesn't have any dependencies, and I did not use or test it since 2015. I do not recommend it to be used, and there are much better solutions out there.
The documentation is in the docs folder, including an example.