feat: readme and doxyfile

README.md

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+# TSTD
+
+A C library providing various string manipulation utilities.
+
+## Usage
+
+To use TSTD in your CMake project, you can either build it from source or include it using FetchContent.
+
+### Integration with FetchContent
+
+Add the following to your CMakeLists.txt:
+
+```cmake
+cmake_minimum_required(VERSION 3.20)
+
+project(myproj C)
+
+set(CMAKE_C_STANDARD 23)
+set(CMAKE_C_STANDARD_REQUIRED ON)
+
+include(FetchContent)
+
+FetchContent_Declare(
+        tstd
+        GIT_REPOSITORY https://github.com/Tilo-K/tstd.git
+        GIT_TAG main
+)
+
+FetchContent_MakeAvailable(tstd)
+
+add_executable(myapp src/main.c)
+
+target_link_libraries(myapp PRIVATE tstd)
+```