Create resizing_vm.md (Islandora#1283)

docs/technical-documentation/resizing_vm.md

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+## Resize vagrant machine
+To expand virtual machine's harddrive for testing of larger files. Once the VM has started, you'll need to `halt` the VM, download and run the script, tell it what size (in MB) and then start the VM.
+The last step `vagrant ssh --command "sudo resize2fs /dev/sda1"` is a check. It should return there was nothing to do. If you already provisioned you VM you can skip the 2 steps with provisioning in them.
+
+```shell
+# Skip this if you VM is already provisioned.
+$ vagrant up --no-provision  <-- Exclude if already running and provisioned.
+
+$ vagrant halt
+
+# Download and run. This will default to the correct name (just press enter) then give the size.
+# Example: `350000` is equal to 350GB
+
+$ wget https://gist.githubusercontent.com/DonRichards/6dc6c81ae9fc22cba8d7a57b90ab1509/raw/98cd6daeafe86c8e830495f9b46eb04e590f4b4f/expand_disk.py
+$ chmod +x expand_disk.py
+$ python expand_disk.py
+$ vagrant up --no-provision
+
+# This step isn't needed but acts as a check to verify it worked.
+$ vagrant ssh --command "sudo resize2fs /dev/sda1"
+
+# Skip this if you VM is already provisioned.
+$ vagrant provision           <-- Exclude if already provisioned.
+```
+
+### Troubleshooting expand_disk.py
+You may need to remove the "resized" version. Assuming your VM location is `~/VirtualBox\ VMs`
+```shell
+$ rm -rf ~/VirtualBox\ VMs/Islandora\ CLAW\ Ansible_resized
+```