Add information about the project

README.md

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+# libsodium-cmake
+
+## Description
+
+CMakeWrapper for [libsodium](https://github.com/jedisct1/libsodium), the modern, portable, easy to use crypto library.
+
+This wrapper is written with a few goals in mind:
+1. It should be easy to build
+1. It should be obvious that libsodium's source code hasn't been touched
+1. It should be easy to integrate into projects
+
+## Building
+
+Clone!
+
+`git clone --recursive https://github.com/robinlinden/libsodium-cmake.git`
+
+Build!
+
+```sh
+mkdir build && cd build
+cmake ..
+make
+make test
+```
+
+## Using in your project
+
+```cmake
+FetchContent_Declare(
+    Sodium
+    GIT_REPOSITORY https://github.com/robinlinden/libsodium-cmake.git
+)
+
+FetchContent_GetProperties(Sodium)
+if(NOT sodium_POPULATED)
+    FetchContent_Populate(Sodium)
+    add_subdirectory(
+        ${sodium_SOURCE_DIR}
+        ${sodium_BINARY_DIR}
+    )
+endif()
+
+target_link_libraries(${PROJECT_NAME}
+    PRIVATE
+        sodium
+)
+```