Add the packaging metadata to build the wormhole snap

snapcraft.yaml

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+name: wormhole
+version: master
+summary: get things from one computer to another, safely
+description: |
+  This package provides a library and a command-line tool named wormhole,
+  which makes it possible to get short pieces of text (and arbitrary-sized
+  files and directories) from one computer to another. The two endpoints are
+  identified by using identical "wormhole codes": in general, the sending
+  machine generates and displays the code, which must then be typed into the
+  receiving machine.
+  The codes are short and human-pronounceable, using a phonetically-distinct
+  wordlist. The receiving side offers tab-completion on the codewords, so
+  usually only a few characters must be typed. Wormhole codes are single-use
+  and do not need to be memorized.
+
+grade: devel
+confinement: strict
+
+apps:
+  wormhole:
+    command: env LC_ALL=C.UTF-8 LANG=C.UTF-8 wormhole
+    plugs: [home, network, network-bind]
+
+parts:
+  magic-wormhole:
+    source: .
+    plugin: python
+    build-packages:
+      - gcc
+      - libffi-dev
+      - libsodium-dev
+      - libssl-dev
+      - make