Update snapcraft.yaml

snap/snapcraft.yaml

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+
+  # After registering a name on build.snapcraft.io, commit an uncommented line:
+  name: barrier-kvm
+  version: '0.1' # just for humans, typically '1.2+git' or '1.3.2'
+  summary: Single-line elevator pitch for your amazing snap # 79 char long summary
+  description: |
+    A multiOS KVM - use one keyboard and mouse across computers
+  grade: devel # must be 'stable' to release into candidate/stable channels
+  confinement: devmode # use 'strict' once you have the right plugs and slots
+
+  parts:
+    barrier-kvm:
+      # See 'snapcraft plugins'
+      plugin: cmake
+