Minor CMake Cleanups

[saidinesh5]

Build both handy as both shared and static library. Build the shared library and examples only optionally.

This way integration becomes easier with downstream projects:

add handy as a git submodule to say a folder called vendor in your CMakeLists.txt

add_subdirectory("vendor/handy" EXCLUDE_FROM_ALL)

target_include_directories(${PROJECT_NAME} PUBLIC
    "vendor/handy"
)

target_link_libraries(${PROJECT_NAME} PUBLIC
    handy_s
)

[saidinesh5]

Hi,

I have updated the README english with the details on how to:

• Build handy examples/shared library (static library gets built by default), and install to a specific path.
• Import handy in their own CMake projects directly.

The shared library and examples are disabled by default because they bloat up compile times when including handy in their own cmake projects. Once we provide proper versioning info along with something like a pkgconfig file, we can also enable building the shared library by default maybe.

Could you update the chinese readme too, once this is merged?

Thanks for the nice library.

D