Building couchbase-lite-core on Windows

@borrrden the missing was a typo of mine.

In the mean time I have found a couple of things…

I was executing the cmake in a normal command prompt. I have tried in a powershell but there was a similar result. The script get_repo_version.ps1 couldn’t be executed due to security restrictions. I had to call:

 Set-ExecutionPolicy -ExecutionPolicy Unrestricted -Scope
CurrentUser

In order to be able to call that script. Then I have tried to run the msbuild in the same powershell but no joy.

I have opened the regular command prompt and it has build successfully.

I think you should add this step to the README file. Cmake should be run on a powershell after setting an unrestricted execution policy.