peers: add design

peers/DESIGN.md

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+# HAProxy Peers Design
+## Connection
+By default, the peers package only opens listeners and waits for HAProxy to connect to it. 
+
+## Sticktables
+A user can create a sticktable definition which can be used to send to a HAProxy peer. Additionally a user can use a
+sent definition to send updates for that specific sticktable. For this, the table has to be registered in a table 
+registry to allow proper referencing.
+
+## Handler
+A handler is the interface to implement when wanting to react to sticktable updates. A user created handler can implement
+specific sub interfaces to also react to handshakes.