attempt at cmakelists

library file layout looks like this (blame visual studio)

(root of git repo named "meow_hash_cpp")
├── CMakeLists.txt
└── meowhash_cpp
	└── meow_hash.hpp

attempt at CMakeLists.txt:
=========

cmake_minimum_required(VERSION 3.5)
project(libmeow_hash_cpp VERSION 0.1.0 LANGUAGES CXX)

add_library(meow_hash_cpp meowhash_cpp/meow_hash.hpp)

target_include_directories(meow_hash_cpp
    PUBLIC
        $<INSTALL_INTERFACE:meowhash_cpp>
		$<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/meowhash_cpp>
)

target_compile_features(meow_hash_cpp PRIVATE cxx_std_17)