Integrate microlog as a submodule in a project and consume it via CMake

[mallenbach]

Hi @an-dr - quick question regarding the way to use the lib with CMake.

In the README, it is said that "Option 2 - CMake Package (recommended CMake > 3.15.0)".

In my project, the preferred approach is to have the dependencies integrated as submodules. Then, thanks to the root CMakeLists of the different projects, I can easily integrate them,

In the current CMakeLists, we can see that the library is declared as an INTERFACE, which is not an expected pattern because it shifts the responsibility of compiling the core logic from the library itself to its consumer.

What do you think about changing it to STATIC instead?

Cheers.

[an-dr]

Good idea. TODO:

• Make the lib static
• Sources - private
• Includes - public
• Remove target installation
• Add the option to the README.md/### 1. Install