Add Fedora 25 box

boxes/fedora.25/Vagrantfile

@@ -0,0 +1,17 @@
+Vagrant.configure("2") do |config|
+  config.vm.box = "fedora/25-cloud-base"
+  config.vm.box_version = "20161122"
+  config.vm.synced_folder ".", "/vagrant", disabled: true
+
+  config.vm.provision "shell", inline: <<-SHELL
+    echo "vagrant:vagrant" | chpasswd
+
+    rpm --import https://packages.microsoft.com/keys/microsoft.asc
+    sh -c 'echo -e "[packages-microsoft-com-prod]\nname=packages-microsoft-com-prod \nbaseurl=https://packages.microsoft.com/yumrepos/microsoft-rhel7.3-prod\nenabled=1\ngpgcheck=1\ngpgkey=https://packages.microsoft.com/keys/microsoft.asc" > /etc/yum.repos.d/dotnetdev.repo'
+    dnf update -y
+    dnf install -y libunwind libicu
+    dnf install -y dotnet-sdk-2.0.0
+
+    dotnet --version
+  SHELL
+end