docs: Added a diagram directory

Added this directory to tack the protocol diagrams.
Initial added:
- Connection
- Data message Echo worker
- Cancel message echo worker

Signed-off-by: Alba Hita Catala <ahitacat@redhat.com>

doc/diagrams/yggd-cancel-command.mmd

@@ -0,0 +1,25 @@
+sequenceDiagram
+participant S as server
+participant B as broker
+participant Y as yggdrasil
+participant D as DBus
+participant W as workerEcho
+
+S ->> B: data/in {"type":"data","directive":"echo","message-id": "1-1","content":"aGVsbG8="}
+B ->> Y: data/in {ditto}
+Y ->> D: Dispatcher method
+D ->>+ W: data/in {ditto}
+Note right of W: echo proccess
+W ->> D: Worker Event {Worker:echo Name:BEGIN}
+D ->> Y: Worker Event {Worker:echo Name:BEGIN}
+W ->> D: Worker Event {Worker:echo Name:WORKING}
+D ->> Y: Worker Event {Worker:echo Name:WORKING}
+rect rgb(255, 153, 153)
+S ->> B: control/in {"type":"command","directive":"echo","message-id": "1-2","content":{"command":"cancel","arguments":{"directive":"echo","messageID":"1-1"}}
+B ->> Y: control/in {ditto}
+Y ->> D: Cancel method {"addr":echo, id:1-2, cancel-id:1-1}
+D ->> W: Cancel method {"addr":echo, id:1-2, cancel-id:1-1}
+Note right of W: Cancel previous echo
+end
+W ->>- D: Worker Event {Worker:echo Name:END}
+D ->> Y: Worker Event {Worker:echo Name:END}

doc/diagrams/yggd-connection.mmd

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+sequenceDiagram
+participant S as server
+participant B as broker
+participant Y as yggdrasil
+participant D as DBus
+participant W as workerEcho
+
+par Connect
+Y ->> D: Get dispatchers
+Y ->> B: connect to broker
+Note right of Y: "yggdrasil Set last will (Disconnect)"
+Y ->> S: control/out {"type":"connection-status", "dispatchers":{}}
+end
+par Data Messages
+S ->> Y: Data messages
+Y ->> W: Data Message
+end
+par Control Messages
+S ->> Y: Control Messages
+and
+Y ->> S: Event Message
+end
+par Disconnect
+Note right of Y: "yggdrasil Disconnect"
+B ->> S: control/out {"type":"connection-status","state":"offline"}
+end

doc/diagrams/yggd-data.mmd

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+sequenceDiagram
+participant S as server
+participant B as broker
+participant Y as yggdrasil
+participant D as DBus
+participant W as workerEcho
+
+S ->> B: data/in {"type":"data","directive":"echo","content":"aGVsbG8="}
+B ->> Y: data/in {ditto}
+Y ->> D: Dispatcher method
+D ->>+ W: data/in {ditto}
+Note right of W: echo proccess
+W ->> D: Worker Event {Worker:echo Name:BEGIN}
+D ->> Y: Worker Event {Worker:echo Name:BEGIN}
+W ->> D: Worker Event {Worker:echo Name:WORKING}
+D ->> Y: Worker Event {Worker:echo Name:WORKING}
+W ->>- D: data/out  message: {"type":"data","directive":"echo","content":"aGVsbG8="}
+D ->> Y: data/out  message: {"type":"data","directive":"echo","content":"aGVsbG8="}
+Y ->> B: data/out {ditto}
+B ->> S: data/out {ditto}
+W ->> D: Worker Event {Worker:echo Name:END}
+D ->> Y: Worker Event {Worker:echo Name:END}
+W ->> D: .Propierties Update DispatchedAt feature
+D ->> Y: .Propierties Update DispatchedAt feature
+Note right of Y: Update status of workers
+Y ->> B: control/out {"type":"connection-status","content":{"dispatchers":{"echo":{"DispatchedAt":"date"}}
+B ->> S: control/out {ditto}