Started on Virt Manager.

This is a new service to manage crosvm instances running VMs. It
provides an AIDL interface which other services can call to start a VM
with some given configuration.

Bug: 171278952
Test: mm
Change-Id: Ie5b10d5f48da430aaeb66af9f2ee082f143472ec
diff --git a/virtmanager/.gitignore b/virtmanager/.gitignore
new file mode 100644
index 0000000..96ef6c0
--- /dev/null
+++ b/virtmanager/.gitignore
@@ -0,0 +1,2 @@
+/target
+Cargo.lock