Added Multipass' notes to the KB

knowledge base/multipass.md

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+# Multipass
+
+## TL;DR
+
+```sh
+# Install.
+brew install --cask 'multipass'
+choco install 'multipass'
+sudo snap install 'multipass'
+
+# Find available VMs.
+multipass find
+
+# Launch a VM.
+multipass launch --name 'primary'
+multipass launch -c '2' -m '2G' -d '20G' -n 'my-test-vm' '21.10'
+multipass launch 'bionic' --name 'test-cloud-init' --cloud-init 'userdata.yaml'
+
+# List all VMs.
+multipass list
+
+# Launch a shell in the VM.
+multipass shell 'vm_name'
+
+# Stop started VMs.
+multipass stop 'vm_name'
+
+# Start stopped VMs.
+multipass start 'vm_name'
+
+# Delete stopped VMs.
+multipass delete my-test-vm
+
+# Clean up unused data.
+multipass purge
+```
+
+## Further readings
+
+- [Website]
+
+## Sources
+
+- [Use Linux Virtual Machines with Multipass]
+
+<!-- project's references -->
+[website]: https://multipass.run/
+
+<!-- external references -->
+[use linux virtual machines with multipass]: https://medium.com/codex/use-linux-virtual-machines-with-multipass-4e2b620cc6