docs: mermaid diagrams

docs/Session.md

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+# Session State Diagram
+
+```mermaid
+stateDiagram-v2
+    [*] --> GrabLocalMedia
+    GrabLocalMedia --> CreateOffer
+    GrabLocalMedia --> Failed
+    CreateOffer --> SetLocalSessionDescription
+    CreateOffer --> Failed
+    SetLocalSessionDescription --> CollectSignalingAndIceCollection
+    SetLocalSessionDescription --> Failed
+    CollectSignalingAndIceCollection --> InviteAnswer
+    CollectSignalingAndIceCollection --> Failed
+    InviteAnswer --> Accept
+    InviteAnswer --> Failed
+    Accept --> Talking
+    Accept --> Failed
+    Talking --> Disconnected
+```

docs/Signaling.md

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+# Signaling State Diagram
+
+```mermaid
+stateDiagram-v2
+    [*] --> PendingConnection
+    PendingConnection --> PendingInvite
+    PendingConnection --> PendingConnection : RETRY
+    PendingConnection --> Failed
+    PendingInvite --> PendingAnswer
+    PendingInvite --> Failed
+    PendingAnswer --> PendingAccept
+    PendingAnswer --> Failed
+    PendingAccept --> PendingAcceptAck
+    PendingAccept --> Failed
+    PendingAcceptAck --> Talking
+    PendingAcceptAck --> Failed
+    Talking --> PendingRemoteHangup
+    Talking --> PendingLocalHangup
+    Talking --> PendingReconnect
+    PendingReconnect --> Talking
+    PendingReconnect --> Failed
+    PendingRemoteHangup --> Disconnected
+    PendingLocalHangup --> Disconnected
+```