feat: design applications and first api calls

Co-authored-by: Walid <87608619+WalidKorchi@users.noreply.github.com>

models/Message.ts

@@ -0,0 +1,20 @@
+import { Type } from '@sinclair/typebox'
+
+import { date, id } from './utils'
+
+export const types = [Type.Literal('text'), Type.Literal('file')]
+
+export const messageSchema = {
+  id,
+  value: Type.String(),
+  type: Type.Union(types, { default: 'text' }),
+  mimetype: Type.String({
+    maxLength: 255,
+    default: 'text/plain',
+    format: 'mimetype'
+  }),
+  createdAt: date.createdAt,
+  updatedAt: date.updatedAt,
+  memberId: id,
+  channelId: id
+}