Add CHANGELOG.md.

CHANGELOG.md

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+## v1.0
+
+### Features
+* Install `nftables` package for Debian based distros.
+* Generate `nftables` main configuration file.
+* Manage global, input and output chains with three dicts.
+* Manage vars, sets and maps definition file.
+* Restart `nftables` service.
+
+### Default Rules
+* Drop blackhole set input packets.
+* Allow localhost traffic.
+* Allow DHCP traffic.
+* Allow SSH input (otherwise Ansible won't work).
+* Allow DNS request.