message: * More detailed messages flow for connection establishing procedure
diff: @@ -43,16 +43,29 @@ L -> SL: Receiver keys and endpoint
  SL -> SW: Store receiver keys and endpoint
  SL -> SS: Receiver did, keys and endpoint. Sender did, keys
  -SS -> RS: init PairwiseCurveCP
  -RS -> RL: Sender keys and did (from connection)
  +
  +SS -> RS: PairwiseCurveCP Hello message
  +RS -> RL: Keys lookup request
  +RL -> RW: Get keys and did for request
  +RW -> RL: Receiver keys and did
  +RL -> RS: Receiver keys
  +RS -> SS: PairwiseCurveCP Welcome message
  +
  +SS -> RS: Next PairwiseCurveCP handshake messages
  +RS -> SS: PairwiseCurveCP handshake messages answers
  +
  +SS -> SL: PairwiseCurveCP connection established
  +
  +SL -> SS: DID message
  +SS -> RS: DID message
  +RS -> RL: Sender did and public key
  RL -> L: GET_NYM/GET_DDO
  L -> RL: Sender keys and did (from Ledger)
  -RL -> RS: Connection verified
  -RS -> SS: Conenction established
  -SS -> SL: Connection established
  +RL -> RL: Connection verification
  +RL -> RS: DID message answer
  +RS -> SS: DID message answer
  +SS -> SL: DID message answer
  SL -> SA: Connection handle (cb)
  -
  -RS -> RL: Connection established
  RL -> RA: Connection handle (cb)
  === Exchange messages ==
  