Added README

Author: cmaglie

README.md

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+# A golang library to run a process with elevated privileges.
+
+This library provides some easy wrappers for the Win32 `ShellExecuteEx` function to be executed with the `runas` "verb" (it will prompt the user, with a UAC dialog, to allow admin privileges).
+
+The provided API, are just two, self-explanatory, functions:
+
+```go
+// RunElevated starts the given process with elevated priviledges.
+// An UAC prompt is displayed to the user to confirm the action.
+func RunElevated(executable, workingDir string, args []string, awaitProcCompletion bool) (int, error)
+```
+
+and
+
+```go
+// IsAdminProcess returns true if the current process already
+// runs as admin.
+func IsAdminProcess() (bool, error)
+```
+
+The same functions called from non-Windows OS, will return an "unimplemented function" error.
+
+### LICENSE
+
+Copyright (c) 2025, ARDUINO SA.
+All rights reserved.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the “Software”), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is furnished
+to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE