Add snap packaging support

This commit adds a snapcraft.yaml file to allow lz4
to be distributed as a snap (see https://snapcraft.io/
for more info on snaps).

Building the Snap
-----------------

To build the snap simply install snapcraft and build the
snap e.g. on Ubuntu by doing:

$ sudo apt install snapcraft
$ cd contrib; snapcraft

This will build a snap that can be published [1] to
e.g. https://snapcraft.io/lz4

If you want to test the snap before publishing you
can do:

$ snap install <snapname>.snap --dangerous

And that will install it on your local host. You
will then have lz4 as a command to run.

Installing the Snap
-------------------

Once published and released in the snapstore your snap
can be installed on any platform that supports snaps
by doing:

snap install lz4

[1] https://docs.snapcraft.io/releasing-to-the-snap-store

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