Add websocket logic server

- Websocket callback binding
- Websocket send message to specific connected socket

GitLab: #53

Change-Id: Ib52db5d99b0bc3ad4d1a775a62fecb9ea3b4d132
diff --git a/common/src/index.ts b/common/src/index.ts
index 41e19b3..8dbab24 100644
--- a/common/src/index.ts
+++ b/common/src/index.ts
@@ -20,4 +20,6 @@
 export * from './Contact.js';
 export * from './Conversation.js';
 export * from './enums/http-status-code.js';
+export * from './enums/websocket-message-type.js';
+export * from './interfaces/websocket-message.js';
 export * from './util.js';