Update to documentation, update with merging run and build commands, cleaned up and organized the project manager

lua/Polydev/utils.lua

@@ -15,6 +15,13 @@ function M.setup(opts)
     M.opts = vim.tbl_deep_extend("force", {}, require("Polydev.configs").get("terminal"), opts or {})
 end
 
+---@param path string
+---@return boolean
+function M.is_dir(path)
+  local stat = vim.loop.fs_stat(path)
+  return stat and stat.type == "directory"
+end
+
 ---@param path string
 ---@param content string
 function M.write_file(path, content)