Initial

What's Changed

• Add gopacket.OpenOffline example by @devlights in #8
• Add cmd/bpffilter by @devlights in #9
• Add cmd/packet example by @devlights in #10
• Add *layers.Ethernet example by @devlights in #11
• Add cmd/layertype/arp example by @devlights in #12
• Add cmd/layertype/ipv4 example by @devlights in #13
• Add cmd/layertype/icmpv4 example by @devlights in #14
• Add cmd/layertype/tcp example by @devlights in #15
• Add layers.LayerTypeUDP example by @devlights in #16
• Add packet.ApplicationLayer() example by @devlights in #17

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Full Changelog: https://github.com/devlights/go-gopacket-example/commits/v0.1.0