Add fields for footer in config

public/config.json

@@ -6,6 +6,10 @@
         "title": "Chatterbox Test Room",
         "avatar": "https://i.imgur.com/KkSYCKB.png"
     },
+    "footer": {
+        "chatterbox_link": "https://element.io/solutions/embedded-live-chat-for-customer-service",
+        "matrix_link": "https://matrix.org"
+    },
     "token": "k9SL1R~GcdbjiFjC",
     "invite_user": "@botuser:matrix.midhun.dev",
     "encrypt_room": true,

src/types/IChatterboxConfig.ts

@@ -11,6 +11,8 @@ export interface IChatterboxConfig {
     encrypt_room: boolean;
     // Configurations for header on chatterbox (containing title, avatar, minimize button)
     header: IHeader;
+    // Configurations for footer on chatterbox (containing what links to use)
+    footer: IFooter;
     // Token needed for token-authenticated registration
     token: string;
     // URL of the image that should be used as the users avatar
@@ -23,3 +25,10 @@ interface IHeader {
     // An optional link to static avatar. If this is not given, the room avatar is used instead
     avatar?: string;
 }
+
+interface IFooter {
+    // Specifies the link which must be opened when chatterbox logo in the footer is clicked.
+    chatterbox_link: string;
+    // Specifies the link which must be opened when matrix branding in the footer is clicked.
+    matrix_link: string;
+}