Add the packaging metadata to build the nheko snap

snap/snapcraft.yaml

@@ -0,0 +1,23 @@
+name: nheko
+version: master
+summary: Desktop client for the Matrix protocol
+description: |
+  The motivation behind the project is to provide a native desktop app for
+  Matrix that feels more like a mainstream chat app (Riot, Telegram etc) and
+  less like an IRC client.
+
+grade: devel # must be 'stable' to release into candidate/stable channels
+confinement: strict
+
+apps:
+  nheko:
+    command: desktop-launch $SNAP/nheko
+    plugs: [network, network-bind, x11, unity7, home]
+
+parts:
+  nheko:
+    source: .
+    plugin: cmake
+    build-packages: [gcc]
+    artifacts: [nheko]
+    after: [desktop-qt5]