docs: bump project version to v1.0.0 (#47)

Author: threeal

CMakeLists.txt

@@ -2,7 +2,7 @@ cmake_minimum_required(VERSION 3.19)
 
 project(
   GitCheckout
-  VERSION 0.0.0
+  VERSION 1.0.0
   DESCRIPTION "Clone and check out a Git repository from a CMake project"
   HOMEPAGE_URL https://github.com/threeal/git-checkout-cmake
   LANGUAGES NONE