Added a WIP todo list

todo.md

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+# Features
+
+- Star message (and other tags)
+- Filter by starred messages (and other tags)
+- User
+  - Name
+  - Phone number
+  - Email
+  - Avatar
+  - About
+  - Status
+  - QR code (principal)
+- Emoticons
+- Authentication
+- Read receipts
+- Delete my account
+- Find contacts (phone number, email, ...)
+- Add contacts
+- Send images + caption
+- Send cycles / tokens
+- Block contact
+- 
+- Send video + caption
+- User preferences
+  - keep messages
+  - keep transactional messages
+  - read receipts on/off
+  - permissions to see the various user info
+- Voice call
+- Video call
+- Group video call
+- Live location
+
+# Scalability
+
+- Have auto-inc particpant ids for group chat so that each message has this id rather than the large principal
+- Shard chats
+
+# Performance
+
+- Peer-to-peer
+
+
+