feat(get-git-root.lua): add Lua function to get the root directory of a Git project using 'git rev-parse --show-toplevel' command

lua/absolute/utils/get-git-root.lua

@@ -0,0 +1,10 @@
+function GetProjectRoot()
+    local git_root = vim.fn.systemlist("git rev-parse --show-toplevel")[1]
+    if git_root == nil then
+        return vim.fn.getcwd()
+    else
+        return git_root
+    end
+end
+
+return GetProjectRoot