Add the packaging metadata to build the pyethapp snap

snap/snapcraft.yaml

@@ -0,0 +1,24 @@
+name: pyethapp
+version: master
+summary: python based client implementing the Ethereum cryptoeconomic state machine
+description: |
+  Ethereum as a platform is focussed on enabling people to build new ideas
+  using blockchain technology.
+
+  The python implementation aims to provide an easily hackable and extendable
+  codebase.
+
+grade: devel # must be 'stable' to release into candidate/stable channels
+confinement: strict
+
+apps:
+  pyethapp:
+    command: pyethapp
+    plugs: [network, network-bind]
+
+parts:
+  pyethapp:
+    source: .
+    plugin: python
+    python-version: python2
+    build-packages: [libssl-dev]