feat: add a basic definition of words

Author: Dany Sluijk

Diff for: src/words.md

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+# Definition of Words
+
+## Identity
+
+A idendity is a collection of devices in the network.
+Generally a identity maps one-to-one to a actual human.
+Any device can create a identity, and invite a second device to the identity.
+Devices with the same identity should always try to create a direct connection to eachother.
+
+## Device
+
+A device is a node inside of the network.
+It has a identity attached to it, unless it's a beacon.
+
+## Beacon
+
+A beacon is a node with a fully open nat.
+It is used as a way to accelerate bootstraping of known nodes.
+If a identity indicates that it uses that beacon, al devices must try to connect to that beacon whenever possible.
+Then if a device wants to find an identity it wil look up the beacons of this identity.
+If a device of the identity is online it should be connected to one of the beacons.