helper script for windows shell environments

[jdknight]

The following provides a helper script to invoke the crowdin CLI in a Windows shell environment (e.g. MinGW), without having to specify the bat extension.

---

The existing Crowdin CLI installation on Windows can run crowdin from a command line prompt as expected:

Microsoft Windows [Version 10.0.19045.2364]
(c) Microsoft Corporation. All rights reserved.

C:\Users\MyUser> crowdin --version
3.9.1

However, if a user starts a shell environment (e.g. MinGW from Git SCM tools), the environment will complain that the command cannot be found:

MyUser@MyUser-PC MINGW64 /
$ crowdin  --version
bash: crowdin: command not found

Users can workaround this by adding the .bat extension:

MyUser@MyUser-PC MINGW64 /
$ crowdin.bat --version
3.9.1

And if an environment includes the provided helper script in this pull request, it drops the requirement of needing to specify the extension:

MyUser@MyUser-PC MINGW64 /
$ crowdin --version
3.9.1

[andrii-bodnar]

@jdknight thanks a lot for your contribution!