test: add Vagrantfile for local dev and testing on Windows

resources/vagrant/.gitignore

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+.vagrant/

resources/vagrant/windows/README.md

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+# Run tests on Windows
+
+``` bash
+cd /path/to/conventional-commits/resources/vagrant/windows
+vagrant up
+vagrant ssh
+```
+
+Once inside the VM:
+
+``` bash
+refreshenv
+cd conventional-commits
+composer install
+composer test
+```

resources/vagrant/windows/Vagrantfile

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+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+
+$script = <<-SCRIPT
+choco install composer php unzip --no-progress -y
+Invoke-WebRequest -Uri https://windows.php.net/downloads/pecl/releases/pcov/1.0.6/php_pcov-1.0.6-7.4-nts-vc15-x64.zip -UseBasicParsing -OutFile C:\\temp\\php_pcov.zip
+unzip C:\\temp\\php_pcov.zip -d C:\\temp\\php_pcov
+move C:\\temp\\php_pcov\\php_pcov.dll C:\\tools\\php74\\ext\\php_pcov.dll
+Add-Content C:\\tools\\php74\\php.ini "`nextension=pcov"
+composer self-update --preview
+SCRIPT
+
+Vagrant.configure("2") do |config|
+  config.vm.box = "jborean93/WindowsServer2019"
+  config.vm.provision "shell", inline: $script
+  config.vm.synced_folder "../../../", "C:\\Users\\vagrant\\conventional-commits"
+
+  config.vm.provider "virtualbox" do |vb|
+    vb.name = "ramsey-conventional-commits-windows"
+  end
+end